Here is the full list of all 42 WARSAW achievements.
The base game contains 25 achievements, and there is 1 DLC pack containing 17 achievements.
Recruit the Sharpshooter for the first time.
Complete the game with the starting three characters still alive.
Recruit the Sapper for the first time.
Unlock all entries in the Codex.
Recruit the Doctor for the first time.
Complete a mission with all insurgents at maximum Health.
Recruit the Scout for the first time.
Kill three enemies with a single skill use.
Recruit the Silent Unseen for the first time.
Recruit the Mechanic for the first time.
Destroy a PaK gun.
Lose a character in battle.
Recruit the Officer for the first time.
Survive for 63 days.
Lose a character due to an event outcome.
Recruit Berling's Soldier for the first time.
Recruit the Turncoat for the first time.
Collect every type of Heavy Weapon in the game.
Collect every type of Submachine Gun in the game.
Collect every type of Machine Gun in the game.
Collect every type of Rifle in the game.
Collect every type of Pistol in the game.
Collect every type of Revolver in the game.
Collect every type of Grenade in the game.
Recruit every unique insurgent in the game at least once.