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