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