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