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