Here is the full list of all 50 Cobalt achievements worth 1,000 gamerscore.
Kill two enemies without touching the ground
Kill an enemy with a deflected bullet
Kill one enemy using physics
Kill an enemy with a scoped bullet
Find one secret
Kill an enemy with your feet
Mine one block
Dodge ten homing missiles without dying
Perfectly deflect a scoped bullet
Kill an enemy with a Boomerang boosted by a Force Device
Blind one enemy with one flashbang
Reach level 10 dance
Kill an enemy with a kicked grenade
Dodge a homing missile
Win one round of Team-Strike with whole team surviving
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
Kill an enemy while rolling
Hack one Computer
Win two Team-Strike rounds in a row without dying
Complete all combat challenge maps
Kill an enemy with a punch to the head while rolling in the air
Boost one reload
Kill two enemies with one bullet
Complete a speed challenge under par time
Beat a combat challenge without firing a weapon or throwable
Free one prisoner
Win TS-match without dying
Kill enemy with klonk
Unlock all unlocks
Complete all speed challenge maps
Perfectly deflect a bullet
Kill two enemies at once
Finish survival round as brain
Kill an enemy with a punched grenade
Buy one Upgrade
Complete survival game without dying
Wiped the entire opposing team in Team-Strike
Lockpick one door
Crack one Safe
Beat a combat challenge with 100% accuracy and 100% health
Complete combat challenge by only eliminating the targets
Destroy one Radio
Complete all brain challenge maps under mountainhammer time
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