Here is the full list of all 22 BloodGate achievements.
Kill 500 enemies
Complete 100 dungeons
Unlock 14 Warlock spells
Unlock 10 Warlock spells
Open 100 boxes
Collect 100 skulls
Unlock 13 Ironclad spells
Unlock 13 Stalker spells
Complete 30 dungeons
Kill 100 enemies
Unlock 10 Stalker spells
Collect 40 skulls
Unlock 10 Ironclad spells
Open 20 boxes
Open 5 boxes
Kill 2000 enemies
Complete 500 dungeons
Collect 300 skulls
Max out 14 Warlock spells
Max out 13 Stalker spells
Max out 13 Ironclad spells
Kill Black Dahlia