Here is the full list of all 84 Cobalt achievements.
Finish survival round as brain
Kill one enemy using physics
Kill two enemies at once
Kill an enemy with a deflected bullet
Hack one Computer
Find 15 secrets
Lockpick one door
Mine one block
Crack one Safe
Blind one enemy with one flashbang
Kill an enemy with a thrown grenade looking away
Kill an enemy with a scoped bullet
Kill two enemies without touching the ground
Kill an enemy while rolling
Find five secrets
Buy one Upgrade
Perfectly deflect a bullet
Find one secret
Dodge ten homing missiles without dying
Dance to the tune of a radio playing music
Complete survival wave without firing a weapon or throwing a grenade
Rescue all prisoners in a combat challenge without them recieving any damage
Kill ten enemies using physics
Kill 100 enemies using physics
Perfectly deflect a scoped bullet
Kill an enemy with your feet
Kill an enemy with a Boomerang boosted by a Force Device
Win one round of Team-Strike with whole team surviving
Blind four enemies with one flashbang
Blind ten enemies with one flashbang
Reach level 10 dance
Reach level 50 dance
Kill five enemies without touching the ground
Kill ten enemies without touching the ground
Kill an enemy with a kicked grenade
Win two rounds in a row of Team-Strike with whole team surviving
Dodge a homing missile
Win a deathmatch without dying a single time
Heal two players with one nano dispenser
Protect Bopo in Survival
Complete a speed challenge under mountainhammer time
Tame a Sabretooth Hamster
Mine ten blocks
Mine 100 blocks
Win three rounds in a row of Team-Strike with whole team surviving
Hack ten Computers
Hack 100 Computers
Win two Team-Strike rounds in a row without dying
Win five Team-Strike rounds in a row without dying
Kill an enemy with a punch to the head while rolling in the air
Boost one reload
Boost 100 reloads
Kill two enemies with one bullet
Kill four enemies with one bullet
Win four rounds in a row of Team-Strike with whole team surviving
Complete a speed challenge under par time
Beat a combat challenge without firing a weapon or throwable
Free one prisoner
Free ten prisoners
Free 100 prisoners
Win TS-match without dying
Kill enemy with klonk
Unlock all unlocks
Complete all speed challenge maps
Complete all combat challenge maps
Boost five reloads in a row without dying
Kill five enemies at once
Kill ten enemies at once
Find 30 secrets
Kill an enemy with a punched grenade
Buy ten Upgrades
Buy 100 Upgrades
Complete survival game without dying
Wiped the entire opposing team in Team-Strike
Lockpick ten doors
Lockpick 100 doors
Crack ten Safes
Complete combat challenge by only eliminating the targets
Crack 100 Safes
Beat a combat challenge with 100% accuracy and 100% health
Destroy one Radio
Destroy ten Radios
Destroy 100 Radios
Complete all puzzle challenge maps