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