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