Full list of all 15 Crimson Alliance achievements worth 250 gamerscore. It takes around 12-15 hours to unlock all of the achievements in the base game.
The base game contains 12 achievements worth 200 Gamerscore, and there is 1 DLC pack containing 3 achievements worth 50 Gamerscore.
Earn a gold medal on Fall of Byzan with each character class.
Achieve a score multiplier of 8X on at least normal difficulty.
Carry the present out of Palace of Death on at least hard difficulty.
Defeat the Soul Siren.
Find and collect all 33 Soul Anchors.
Max out any character stat.
Complete Requiem.
Kill 25 enemies with explosive barrels in a single level.
Revive yourself while playing alone.
Defeat Gashadokuro, the Death Knight.
Unleash your Ultimate attack.
Earn a gold medal or better on every Main Campaign level on at least normal difficulty.
Complete Inferno.
Complete Dead Among Us.
Survive Fistful of Coins wave 7 on at least normal difficulty.