Here is the full list of all 30 Warhammer 40,000: Battlesector achievements.
Win a skirmish battle against Blood Angels
Complete the Age of Crimson Dawn campaign
Sacrifice all Death Company units at Wind River Canyon
Trigger the Volatile ability
Complete Act Two
Clear Kemrender of infestation nodes
Kill a Genestealer
Unlock an Adepta Sororitas unit
Collect Gallians staff
Kill a Trygon with a pistol
Unlock a Tier 5 node in a tech tree
Recruit a Baal Predator
Recruit a Furioso Dreadnought
Complete Act One
Unlock a Tier 3 node in a tech tree
Heal an ally
Unlock a Tier 1 node in a tech tree
Unlock a flying unit
Score a critical hit with a chainsword
Kill a Tyrannofex
Kill unit with a flame weapon
Complete the tutorial
Score a critical hit with a bolter
Kill an enemy unit with a grenade
Use the fallback command
Use the interact command
Call in a Stormraven missile strike
Complete any campaign mission using only melee
Kill a Hive Tyrant in a multiplayer game
Kill a Blood Angels Lieutenant in a multiplayer game