Achievements
     Complete each achievement to get the allotted gamerscore.

Airstrike (20):          Complete mission 4

Betrayal (20):           Complete Prologue

Cable Ride (20):         Get to the upper cloister

Duel (20):               Defeat Elena

Fire Away (20):          Fire rocket launcher 20 times

Going Down (20):         Find Wolf's lab

Health Booster (30):     Find 3 health boosters to increase your health

Heaven's Triumph (20):   Complete mission 2

Infernal Power (10):     Obtain Infernal power

Mana Booster (30):       Find 3 mana boosters to increase your mana

Multiple 
Teleportation (10):      Obtain multiple Teleportation power

Precision (20):          Don't activate the gas traps in the plane

Reflection (20):         Find the device in the plane

Running Man (20):        Complete mission 3

Steelworks (20):         Enter the Steelworks

Teleportation (10):      Obtain Teleportation power

The Acolytes (20):       Survive the upper cloister

The Chase (20):          Find Elena

The Cloister (20):       Get inside the cloister

The Collector (20):      Retrieve energy from 100 enemies

The Cowboy Way (20):     Find Dual Pistol

The Dark Angel (20):     Join the Abyss

The Dark Force (20):     Use infernal powers 100 times

The Easy Way (100):      Complete game in easy difficulty

The Infernal Way (200):  Complete game in hard difficulty

The Island (20):         Find the Observatory

The Normal Way (150):    Complete game in medium difficulty

The Resurrection (20):   Find Barbara

The Saint (20):          Complete Mission 5

Walls of Pain (20):      Complete mission 1

Wings of Steel (20):     Find the plane