Always get Legendary weapons...
	Easy "Twins" achievement...
	Secret Achievements...
	Various Achievements...

Find a weapon box or container and remain idle at least four real time hours next to it. Open the container to claim a Legendary weapon.

There are twin zombies at the Pinai Ferry Station that must be killed. The first twin can be found at the beach to the north of the ferry station. It will appear from the lifeguard's shack on the beach. After killing it, go to the billboard with the pick-up truck on top of it at south section of the ferry station. Go to the back of the billboard and climb up the ladder. You can collect sniper rifle and bait from the truck. While up there, look toward the ocean and notice that the building to the left is open. Throw the bait near the doors to draw out the other twin.

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Breaching the Tunnels (15 points)	Successfully defend the tunnel entrance.
Combat on the roof (15 points)	Survive the horde on the roof.
Defeat Harlow (15 points)	Defeat Harlow.
First Do No Harm (30 points)	Finish hospital quests for Cecil.
Heart of Darkness (15 points)	Find a boat for use in the jungle.
Henderson Town (15 points)	Reach Henderson.
Meeting Serpo (15 points)	Make pact with Serpo.
Military Base (30 points)	Gain access to a long-range radio station.
Serving Science (30 points)	Finish quests for Dr. Kessler.
The Cinema (15 points)	Clear out the cinema.
The Docks (15 points)	Enter the docks in Quarantine Zone.
The Storm (15 points)	Escape from the ship.
You've tricked me once (30 points)	Finish the game.

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Achiever (100 points)	Finish all quests in the game.
At Your Service (15 points)	Rescue 20 NPCs that have been grabbed by monsters.
Better than the arm (30 points)	Kill 25 monsters with a chainsaw.
BrainLess (15 points)	Kill 50 monsters by smashing, decapitating or shooting them in the head.
Bully (15 points)	Kill 100 monsters with a kick.
Dream Team (15 points)	Complete all the main quests cooperatively with any number of partners.
Hunter-Seeker (90 points)	Find and kill all named champion monsters located in dead zones.
Hurler (15 points)	Kill 100 monsters with thrown melee weapons.
It's an Order (15 points)	Mark 100 opponents which were then killed by your co-op partners.
Jetboat (90 points)	Kill 100 monsters using the boat's speed boost.
Juggernaut (15 points)	Kill 100 enemies using charge attacks.
King among Kings (30 points)	Kill special enemies: Grenadier, Thug, Wrestler, Infected, Suicider, Screamer, Butcher, Floater.
Mystery solved (15 points)	Find all the secret files.
News junkie (30 points)	Find all the volunteer's voice recordings.
Obtain level 50 (30 points)	Obtain level 50.
Obtain level 70 (90 points)	Obtain level 70.
Professional Tourist (30 points)	Find all pages from the guide book.
Siege Hammer (15 points)	Install a total of 5 barricades during hub defense.
The Collector (15 points)	Find 50% of collectibles.
The Hoarder (30 points)	Find all collectibles.
The Hurt Mine Locker (15 points)	Kill 10 monsters with one mine.
Twins (30 points)	Kill the Twins.