Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Ambush	Set up 15 simultaneously active claymore mines.
Barrier	Survive for 30 waves in Tactical Mode on the Prison map.
Blast	In one game kill 12 bosses with inventory landmines.
Bullet Proof	In one game survive 25 missile hits from a Rotor Boss.
Burst	In a game kill 3 Mortar Bosses with Grenade Sentry guns.
Cash Grab	In one game pick up 25000 coins from dead enemies.
Close Call	During Bullet Time, kill 5 Suiciders with the Steam Hammer.
Combat	In Tactical Mode, in a single wave kill 3 melee bosses in a row.
Commander	Reach the Commander Player Rank.
Dangerous Game	In a game get damaged by 20 Demolition or Chainsaw Boss melee hits.
Defenseless	Survive 20 minutes on Shipwreck without building anything.
Detonate	Explode 500 suicide bombers.
Drone Strike	In a game kill 2 bosses during a single Ghost powerup.
Exploder	In a game blow up 10 gas cannisters dropped by dead suiciders.
Fire Storm	In a game use Cluster Bombs to kill 150 enemies.
Frenzied	Pick up an AK47, get Rage Trigger + Frenzy and kill 123 enemies during Rage.
Grenadier	In a game kill 100 suiciders using grenade sentries.
Guns Pointed Low	In a game survive for 10 minutes without using any ranged weapon.
Hammer Twins	Kill 2 Demolition Bosses within 60 seconds of each other.
I Can Take It!	In one game get hit by every boss type.
IED	In a game pick up and detonate 10 ieds.
Intruder	On Campsite map survive 10 minutes without a regular enemy reaching the tent.
Jack In The Box	In a game explode 21 flares using Payload.
KillStreak100	Kill 100 enemies without taking any damage.
KillStreak1000	Kill 1000 enemies without taking any damage.
KillStreak250	Kill 250 enemies without taking any damage.
KillStreak500	Kill 500 enemies without taking any damage.
Machine Gun Rage	Use the M1919 Machine Gun to kill 5 bosses during Rage powerups in one game.
Massacre	In a single wave, kill 250 enemies using explosions.
Master	Reach the Master Player Rank.
NoFlyZone	In a game kill 5 Rotor Bosses while they are flying.
Random Squad	In a public on-line game reach wave 20.
Remote Lethal	In a game kill 3 Flamer Bosses with a M2 Weapon Station.
Scorched	In a game get damaged by 5 Flamer Boss death explosions.
SemiPro	Reach the Veteran Player Rank.
Sentry	In a game deploy one sentry gun and let it kill 666 enemies.
Serial Kill	Without taking damage, kill 1000 enemies within the first 6 minutes of a game.
ShellShock	In a game kill 1000 enemies using shotgun sentries.
Suicidal	In a game get damaged by 10 suiciders.
Support Gunner	In one game kill 500 enemies using the M1919 Machine Gun during Bullet Time.
Tank	In a game kill 3 Tank Bosses.
Team Squad	In a friends on-line game reach wave 30.
Terrorist Tendencies	In a game stock handgrenades, pick only Anarchist then kill 1500 inside 10 minutes.
The First 300	Kill 300 enemies in the first 3 minutes of a game.
Turning Pro	Reach the Captain player rank.
Underdog	Survive 5 minutes without killing any boss.
Vandalism	During the building phase, destroy 5 items created by another player.
Warlord	Reach the Warlord Player Rank.
We Need War	In a Coop game kill 2500 + 25 bosses. Kills count with your health 75%+.
You Need War	In a SP game kill 2000 + 20 bosses. Kills count with your health 75%+.