Full list of all 21 Warhammer 40,000: Boltgun achievements.
The base game contains 12 achievements, and there is 1 DLC pack containing 9 achievements.
Complete all Chapter I Missions
Complete all Chapter II Missions
Complete all Chapter III Missions
Complete all Missions on The Emperor Protects Difficulty
Complete all Missions on My Armour is Contempt Difficulty
Complete all Missions on Emperor’s Mercy Difficulty
Complete all Missions on Exterminatus Difficulty
Defeat a Lord of Change
Defeat a Great Unclean One
Find all Secrets in Chapter 1
Find all Secrets in Chapter 2
Find all Secrets in Chapter 3
Complete Forges of Corruption on The Emperor Protects Difficulty
Complete Forges of Corruption on My Armour Is Contempt Difficulty
Complete Forges of Corruption on Emperor's Mercy Difficulty
Complete Forges of Corruption on Exterminatus Difficulty
Defeat a Helbrute
Find all secrets in Forges of Corruption
Complete Horde Mode on any difficulty
Complete Horde Mode on Emperor's Mercy Difficulty
Complete Horde Mode on Exterminatus Difficulty