Here is the full list of all 18 Cold Space achievements.
Experience your first death
Die trying to escape from the map
Die 10 times without getting any kills
Kill five different enemies without dying
Win with a 50 frag advantage
Make 10 frags in one round
Make 20 frags in one round
Make 30 frags in one round
Make 40 frags in one round
Make 10 frags without dying
Make 15 frags without dying
Make 20 frags without dying
Make 25 frags without dying
Use the jetpack 100 times in one round
Make 50 long slides in one round
Defend yourself with the shield 30 times
Collect all items
Kill 10 enemies with the knife in one round