Here is the full list of all 16 DOOMED achievements.
Find a secret zone in level 2
Find a secret zone in level 3
Find a secret zone in level 5
Find a secret zone in level 8
Find a secret zone in level 9
Find a secret zone in level 11
Complete Level 1
Kill more than 100 enemies
Complete Level 6
Complete Level 10
Complete Level 14
Kill more than 500 enemies
Complete Level 18