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
Win a skirmish battle against Blood Angels
Complete the Age of Crimson Dawn campaign
Sacrifice all Death Company units at Wind River Canyon
Call in a Stormraven missile strike
Complete Act Two
Clear Kemrender of infestation nodes
Kill a Genestealer
Unlock an Adepta Sororitas unit
Collect Gallians staff
Trigger the Volatile ability
Kill a Trygon with a pistol
Recruit a Baal Predator
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
Kill an enemy unit with a grenade
Heal an ally
Unlock a Tier 1 node in a tech tree
Unlock a flying unit
Score a critical hit with a chainsword
Kill unit with a flame weapon
Complete the tutorial
Score a critical hit with a bolter
Use the fallback command
Use the interact command
Kill a Tyrannofex