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