Here is the full list of all 36 Infested Planet achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Finish the Endgame mission and the campaign.
Undo 10 mutations at once during the Endgame mission.
Start a skirmish custom map.
Finish a random capture mission with the Guardians mutation.
Finish a random capture mission with the Sharp Spikes mutation.
Win a capture map at Terminus difficulty.
Finish a random capture mission with the Burrowing Hive mutation.
Finish a random capture mission with the Clone Strike mutation.
Win a capture map at Abyss difficulty.
Win a capture map at Ruins difficulty.
Kill all hives on a raid map at Terminus difficulty.
Unlock all weapons, tech and buildings in the campaign.
Kill all hives on a raid map at Abyss difficulty.
Kill all hives on a raid map at Ruins difficulty.
Finish the Periapsis mission.
Finish Periapsis without losing a bunker.
Finish the Tension mission.
Finish Tension without losing a crate to the aliens.
Finish Preparations within 10 minutes.
Finish Night and Day in 11 minutes or faster.
Finish the Anabasis mission.
Finish the Memento Mori mission.
Finish Memento Mori while holding more than 1 point.
Finish the The Return mission.
Finish the Preparations mission.
Finish the Night and Day mission.
Finish Night and Day without losing a point
Finish the Contact mission.
Finish the Science Station mission.
Kill all hives in the Sudden Strike mission.
Finish the Crow's Neck mission.
Finish the Blitzkrieg mission.
Finish the Foundations mission.
Finish the Arsenal mission.
Finish the Warpath mission.
Finish the Opening Gambits mission.