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