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