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.
Start a skirmish custom map.
Win a capture map at Ruins difficulty.
Finish the Endgame mission and the campaign.
Finish the Periapsis mission.
Finish Periapsis without losing a bunker.
Finish the Tension mission.
Unlock all weapons, tech and buildings in the campaign.
Finish the Anabasis mission.
Finish Memento Mori while holding more than 1 point.
Finish the Memento Mori mission.
Kill all hives on a raid map at Abyss difficulty.
Kill all hives on a raid map at Ruins difficulty.
Finish the The Return mission.
Finish the Preparations mission.
Finish Preparations within 10 minutes.
Finish the Night and Day mission.
Finish Night and Day in 11 minutes or faster.
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.
Win a capture map at Terminus difficulty.
Win a capture map at Abyss difficulty.
Kill all hives on a raid map at Terminus difficulty.
Finish Night and Day without losing a point
Finish Tension without losing a crate to the aliens.
Undo 10 mutations at once during the Endgame mission.
Finish a random capture mission with the Sharp Spikes mutation.
Finish a random capture mission with the Burrowing Hive mutation.
Finish a random capture mission with the Guardians mutation.
Finish a random capture mission with the Clone Strike mutation.