Here is the full list of all 12 BloodRayne Betrayal achievements.
Finish every level with the ranking "Dhampir"
Defeat Crab Puncher without getting hit
Complete any level while taking no damage
Kick open the Coffin Rocket 20 times
Collect all the ancient vampire skulls
Kill 250 enemies with environmental hazards
Find the hidden idol
Complete the game
Hop on 50 heads in a row without touching the ground
Chain-explode 5 enemies
Activate BloodRayne: Betrayal's alternate soundtrack
Kill 5 enemies with a single gunshot