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