10 achievements for 1000 Gamerscore
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Mother May I?
Defeat the Mother of All Demons on The Absolution
150 Gamerscore
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Walk the Path
Finish the Lost Levels mission
125 Gamerscore
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Secret Sleuth
Discover a secret area
50 Gamerscore
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My Cause is Just, My Will is Strong
Find the BFG9000
50 Gamerscore
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Unholy Firepower
Find the Unmaker
75 Gamerscore
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Persistence is the Key
Acquire all 3 Demon Key Artifacts in the main campaign
125 Gamerscore
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Rip and Tear!
Kill a Cyberdemon
100 Gamerscore
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That was Fun
Finish a 'Fun' Level
100 Gamerscore
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RVNH3CT1CD3M0???
Locate the secret level 'Hectic'
100 Gamerscore
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Escape Artist
Finish 'No Escape' on Watch Me Die! skill level
125 Gamerscore