Here is the full list of all 38 HELLDIVERS 2 achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Reach max level on one ship module.
Upgrade all ship modules at least 1 level.
Complete at least 100 missions.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Shoot off both arms on a Hulk and then extract while it's alive.
Kill a Charger with a resupply pod.
Complete a full Extreme difficulty Blitz mission and extract in under 6 minutes.
Complete a full Hard difficulty mission or higher without anyone firing their primary or support weapon.
Extract at least 15 rare samples from a mission as a team.
Extract with at least 15 common samples.
Kill 100 enemies using fire damage during the same mission.
Have 6 orbital barrage stratagems in the same place at the same time.
Complete an Extreme difficulty mission or higher without anyone dying.
Play at least 50 missions.
Kill 25 enemies with one stratagem.
Kill a target at a distance of over 100m.
Extract with a full team on a Hard difficulty or more mission.
Be injured in all limbs at the same time.
Kill 5,000 enemies.
Defeat a Bile Titan
Heal another player using stims.
Complete 10 tactical objectives.
Provide assisted reload for a teammate.
Play a planet defense mission.
Defeat a Hulk.
While using a jump pack, knock yourself into a ragdoll state.
Kill a bug warrior with a shotgun within 1 meter.
Throw back a live grenade.
Complete a mission but fail to extract.
Fly at least 25 meters from the shockwave of an explosion.
Complete a Stalker Hive tactical objective.
Customize your Helldiver with new cape, armor, and helmet.
Extract after the timer reaches zero.
Kill 150 enemies during the same mission.
Play 1 Bot Mission.
Extract from a mission during nighttime.
Play 1 Bug Mission.
Complete Basic Training.