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