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Character Gets:
Get Confed Marine - Locate DNA Sequence in Mission 1 or Mission 6
Get Feral Colonist - Locate DNA Sequence in Mission 2
Get Feral Outcast - Locate DNA Sequence in Mission 3
Get Seer Follower - Locate DNA Sequence in Mission 4
Get Militia - Locate DNA Sequence in Mission 5 or Mission 11
Get Outcast Shaman - Locate DNA Sequence in Mission 7
Get Seer Priest - Locate DNA Sequence in Mission 8
Get Feral Shaman - Locate DNA Sequence in Mission 9
Get Gunthar Ghent - Locate DNA Sequence in Mission 10
Get Shadoon - Locate DNA Sequence in Mission 12
Get Fire Hound - Locate DNA Sequence in Mission 13
Get McTavish - Locate DNA Sequence in Mission 14
Get Shrike Soldier - Locate DNA Sequence in Mission 15
Get Shrike Heavy - Locate DNA Sequence in Mission 16
Get Shrike Hound - Locate DNA Sequence in Mission 17
Get Hunter Lord - Locate DNA Sequence in Mission 18

Various Cheats:
Put in one of the following names for your profile name:

BRUTAL - Brutal Difficulty
DBLDAY - Die fast
DEADAIM - Aim better
ERINROBERTS - Better Defense
HVYMTL - Get Cartoon Mode
MATTSOELL - Tougher Characters
RAPIDFIRE - Rapid Fire Weapons
SPRAGNT - Stupid AI