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.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Upgrade all ship modules at least 1 level.
Kill a bug warrior with a shotgun within 1 meter.
Complete at least 100 missions.
Play a planet defense mission.
Kill 100 enemies using fire damage during the same mission.
Shoot off both arms on a Hulk and then extract while it's alive.
Defeat a Hulk.
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.
Play at least 50 missions.
Play 1 Bot Mission.
Kill 5,000 enemies.
Defeat a Bile Titan
Extract with a full team on a Hard difficulty or more mission.
Complete a Stalker Hive tactical objective.
Complete a mission but fail to extract.
Extract after the timer reaches zero.
Kill 25 enemies with one stratagem.
Complete 10 tactical objectives.
Heal another player using stims.
Fly at least 25 meters from the shockwave of an explosion.
Provide assisted reload for a teammate.
Kill a target at a distance of over 100m.
Extract from a mission during nighttime.
Kill 150 enemies during the same mission.
Play 1 Bug Mission.
Customize your Helldiver with new cape, armor, and helmet.
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.
Have 6 orbital barrage stratagems in the same place at the same time.
Be injured in all limbs at the same time.
Throw back a live grenade.
While using a jump pack, knock yourself into a ragdoll state.