Here is the full list of all 13 NecroBoy : Path to Evilship achievements.
Open a door!
Revive one NecroMinion
Revive 100 NecroMinions!
Open 100 doors!
It still hurts
Change your NecroMinions appearance
Collect all NecroMinion's skins!
Beat the Goat
Beat the Twins
Beat the Reaper
Get your hands on the Necronoss
Find a strange level
Complete all strange levels