Easy "Distraction Tactician" a...
	Easy "Enhanced Lethality Demon...
	Easy "Evidence Concealed" achi...
	Easy "Hostages Secured" achiev...
	Easy "Hostile Shield Secured" ...
	Easy "Mission Footprint Zero" ...
	Easy "Tri-Rotor Functionality"...
	Easy money, all weapons upgrad...
	Various Steam Achievements...

You can get the "Distraction Tactician" achievement almost anywhere in the game, but Mission 4: Private Estate is a good place to get it. At the beginning of the mission, search for a guard, and hide behind a nearby object. Then, make some noise and lure the guard to you. When the guard gets close, eliminate him.

Play Mission 2: Insurgent Stronghold on the Rookie difficulty. A few minutes after the mission begins, you will have to go under a wooden bridge. At this point, you should have a full execution meter. While you are under that bridge, shoot at it until the guards hear you. This will make them group up, which is what you want to happen. They need to be as close as possible together. There is also a checkpoint in that area -- so you can keep retrying, if necessary. When you reach the other side of the bridge, go through the building, up the stairs, and wait at the window outside. Wait until the two guards inside the house and one from the outside are in your line of fire. Mark them, and use your execution to kill three enemies at once. Before shooting them, throw some flashbangs so the other enemies will not attack you. Then, quickly kill an enemy with hand-to-hand combat to fill up your execution meter, and mark and execute the remaining three enemies. Note: You must equip the strongest armor in the game or else the enemies will kill you. Activate the sonar vision on your goggles to see enemies quickly.

When you kill the first enemies in Mission 1: Safe House, you will be in an alley. There are a total of six enemies and five containers in this area. One container is in the alley, and four are in the building you need to enter. Eliminate all of the enemies, and then put one in each of the five blue containers to get the "Evidence Concealed" achievement.

At the end of Mission 7: Transit Yards, after defusing all the bombs, you will be in a train with some enemies and civilians. Once you reach the end of the train, two enemies will take hostages and use them as human shields. If you get to close or start shooting, they will kill the hostages. To save them, throw sleeping gas. You can buy sleeping gas on your airplane (headquarters) at any time. Alternatively, you can also mark the enemies and use your execution ability to kill them immediately.

At the end of Mission 6: Special Missions HQ, you will encounter an enemy with a shield. A short cutscene will begin playing when you enter the room. Eliminate the other enemies, and let the Infantryman get close to you. Then, shoot his shield until he breaks down. You will then have a couple of seconds to get behind him and eliminate him with hand-to-hand combat. Pick up his shield to get the "Hostile Shield Secured" achievement.

Mission 1: Safe House is one of the easiest and shortest missions in the game. Play this mission on the Rookie difficulty. The enemies will not spot you as easily. You also may want to attempt this after you have purchased certain equipment to make things easier. You can replay all missions at any point in the game (even after completing the story). When attempting to get the "Mission Footprint Zero" achievement, the enemies never can shoot at you or tigger an alarm. Their "attention meter" (the half circle that fills up when they see you) may never turn red. If it turns red, you have been detected and need to restart. If the half circle turns all white, you are still fine and can proceed. As long as you kill enemies before their attention meter turns red, you will be fine to proceed.

Immediately after Mission 6: Special Missions HQ begins, you can see some surveillance cameras. Hide behind a wall, and release your Tri-Rotor drone. Steer it to the camera, and shoot a sticky shocker dart. This will destroy the camera, and you will get the "Tri-Rotor Functionality" achievement. Note: You can purchase the Tri-Rotor drone on your airplane (headquarters) for $72,000. It is not a requirement to upgrade it to get this achievement.

When you start the game, you will have to complete the prologue mission. Then, you will proceed to your plane to start the main missions. You can also start side missions by talking to your team. Talk to Grim to get four side missions to complete before you start the main missions. When you complete all of Grims missions, new gear will be unlocked under the "Customize Gear" option. You will now have all the stealth gear and can start Mission 1: Safe House. This is one of the quickest missions in the game, and if you complete it without killing anybody and stay undetected, you will get a lot of money when you complete the mission. Once you finish the mission, you will be back at the plane. While on the plane, go to the "SMI Panel". Display the map, and view the missions. You will have the option to replay the "Safe House" mission. Replaying and completing this mission eight times will get you more than enough money to buy all the planes upgrades and all of Sam Fisher's gear and weapons.

Successfully complete the indicated task to unlock the corresponding achievement.

Achievement	How to unlock
4th Echelon Commendation	Complete every single player mission on Realistic difficulty.
4th Echelon Officer	Complete every single player mission on Perfectionist difficulty.
4th Echelon Status Confirmed	Complete the single player campaign.
Ambush Escaped	Complete Insurgent Stronghold on any difficulty.
American Consumption Prevented	Complete American Consumption on any difficulty.
American Freedom Averted	Complete Transit Yards on any difficulty.
American Fuel Engaged	Complete LNG Terminal on any difficulty.
Asset Retrieval	Complete Safehouse on any difficulty.
C&C Optimized	Fully upgrade your headquarters.
Combined Op Successful	Complete a COOP mission with a teammate.
Combined Operator	Complete all 4th Echelon Missions from Isaac Briggs with a teammate.
Data Security	Hack 23 Blacklist Laptops.
Distraction Tactician	Call an enemy over, then take them down undetected when they investigate.
Elite Killing Team	Dual Execute with a teammate to take down a helmeted enemy.
Enhanced Lethality Demonstrated	Using Mark & Execute, take down 6 enemies in under 14 seconds.
Evidence Concealed	Hide 5 bodies in containers.
Extraction Operator	Complete all 4th Echelon Missions from Charlie Cole.
Firearm Accessed	Unlock a Merc's Light Machine Gun.
HVTs Secured	Capture 20 High Value Targets.
Hostages Secured	Save the hostages in the Transit Yards.
Hostile Shield Secured	Take down a Shielded Infantryman hand to hand and take his shield.
Hunter Operator	Complete all 4th Echelon Missions from Andriy Kobin.
Infiltration Operator	Complete all 4th Echelon Missions from Anna Grímsdóttir.
Infiltration/Interrogation	Complete Detention Facility on any difficulty.
Intel Acquired	Collect 24 Dead Drop flash drives.
Iranian Intel Retrieved	Complete Special Missions HQ on any difficulty.
Lead Interrogator	Win the COOP interrogation in VORON Station.
Lethal Versatility	Win a match in each Spies vs Mercs game mode.
Mission Footprint Zero	Complete a single player mission without being detected during gameplay.
No Kill Option Engaged	Complete the single player campaign without killing anyone as Sam Fisher.
Officer of the Day	Complete a Daily Challenge.
Paladin Restored	Survive the attack on Paladin.
Personal Kit	Unlock a custom loadout slot for Spy or Merc.
Rated Aggressor	Capture a control point in a Spies vs Mercs Uplink Control match.
Rated Hacker	Hack a terminal in a Spies vs Mercs SvM Blacklist or SvM Classic match.
Rated Intel Courier	Carry home the intel in an Spies vs Mercs Extraction match.
Seven Day Duty Shift	Complete a Spies vs Mercs Weekly Challenge.
ShadowNet Online	Access ShadowNet for the latest news & challenges.
Support Ops	Get 10 objective assists in Spies vs Mercs.
Tactical Stye	Assault	Master Assault playstyle on 7 missions.
Tactical Style	Ghost	Master Ghost playstyle on 7 missions.
Tactical Style	Panther	Master Panther playstyle on 7 missions.
Terrorist Factor Turned	Complete Private Estate on any difficulty.
Tracker Placed	Complete Abandoned Mill on any difficulty.
Tri-Rotor Functionality	Disable a security device using the Tri-Rotor.
Trusted Agent	Achieve Rank 10 in Spies vs Mercs.
Upgraded Gear Accessed	Purchase every upgrade for one gun.