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