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