Here is the full list of all 13 NecroBoy : Path to Evilship achievements.
Revive one NecroMinion
Revive 100 NecroMinions!
Open a door!
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