Here is the full list of all 68 VERSUS SQUAD achievements.
In Tactical Mode, in a single wave kill 3 melee bosses in a row
In one wave, get hit by the Gatling Gun, Rotor and Tank bosses
Explode 500 suicide bombers
Reach the Veteran Player Rank
Kill 500 enemies without taking any damage
In a game blow up 10 gas cannisters dropped by dead suiciders
In a game kill 3 Tank Bosses
In a Coop game kill 2500 + 25 bosses. Kills count with your health 75%+
In one game get hit by every boss type
In a game get damaged by 5 Flamer Boss death explosions
In one game, get damaged 100x by bosses
In a single wave, kill 250 enemies using explosions
Kill 300 enemies in the first 3 minutes of a game
In an online coop game, revive other players 5x
Kill 250 enemies without taking any damage
Survive 5 minutes without killing any boss
Kill 100 enemies without taking any damage
During the building phase, destroy 5 items created by another player
In a game get damaged by 10 suiciders
In a game deploy one sentry gun and let it kill 666 enemies
In a game survive for 10 minutes without using any ranged weapon
In a game pick up and detonate 10 ieds
Kill 1000 enemies without taking any damage
Survive 20 minutes on Shipwreck without building anything
Set up 15 simultaneously active claymore mines
Survive for 30 waves in Tactical Mode on the Prison map
In a SP game kill 2000 + 20 bosses. Kills count with your health 75%+
In a game stock handgrenades, pick only Anarchist then kill 1500 inside 10 minutes
In a game get damaged by 20 Demolition or Chainsaw Boss melee hits
In a game kill 3 Flamer Bosses with a M2 Weapon Station
In a game use Cluster Bombs to kill 150 enemies
Pick up an AK47, get Rage Trigger + Frenzy and kill 123 enemies during Rage
During Bullet Time, kill 5 Suiciders with the Steam Hammer
Reach the Captain player rank
In a public on-line game reach wave 20
In a friends on-line game reach wave 30
In one game survive 25 missile hits from a Rotor Boss
In one game pick up 25000 coins from dead enemies
In one game kill 12 bosses with inventory landmines
Kill 2 Demolition Bosses within 60 seconds of each other
In a game explode 21 flares using Payload
In a game kill 5 Rotor Bosses while they are flying
Reach the Commander Player Rank
Reach the Warlord Player Rank
Reach the Master Player Rank
In a game kill 100 suiciders using grenade sentries
In a game kill 1000 enemies using shotgun sentries
Use the M1919 Machine Gun to kill 5 bosses during Rage powerups in one game
In one game kill 500 enemies using the M1919 Machine Gun during Bullet Time
In a game kill 2 bosses during a single Ghost powerup
In a game kill 3 Mortar Bosses with Grenade Sentry guns
Without taking damage, kill 1000 enemies within the first 6 minutes of a game
On Campsite map survive 10 minutes without a regular enemy reaching the tent
Do not use any powerups for 10 minutes
In one game, kill 1000 enemies using Heavy Seekers
In a game, kill 8 bosses using Claymore mines
In one wave, get hit by a Mortar Boss 15x
In one game, spend 10000 coins on repairs
Get Wild Bunch and Strike Team and kill a Gatling Gun Boss using Ghosts
In one game, pick up 50 Fuel Bombs
In a game use the Jackhammer to kill 5 Demolition Bosses
For 20 minutes kill bosses only with a NailGun, others only with a Jackhammer
In a single wave set 400 enemies on fire using a Flame Thrower
Survive 25 waves on the Paintball map without taking any damage from the Gatling Gun boss
In one game kill 100 suicide bombers using the SAIGA shotgun
Enable manual repair mode and repair one object to 100% HP
Survive for 18 waves in Tactical Mode on the Cellblock map
Survive for 20 waves in Tactical Mode on the Great Wall map