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.
Upgrade all ship modules at least 1 level.
Kill 25 enemies with one stratagem.
Customize your Helldiver with new cape, armor, and helmet.
Complete at least 100 missions.
Extract with at least 15 common samples.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Kill 5,000 enemies.
Reach max level on one ship module.
Play at least 50 missions.
While using a jump pack, knock yourself into a ragdoll state.
Extract at least 15 rare samples from a mission as a team.
Defeat a Bile Titan
Kill a bug warrior with a shotgun within 1 meter.
Complete a mission but fail to extract.
Throw back a live grenade.
Extract with a full team on a Hard difficulty or more mission.
Fly at least 25 meters from the shockwave of an explosion.
Complete 10 tactical objectives.
Extract after the timer reaches zero.
Provide assisted reload for a teammate.
Defeat a Hulk.
Play 1 Bot Mission.
Play a planet defense mission.
Heal another player using stims.
Complete a Stalker Hive tactical objective.
Extract from a mission during nighttime.
Kill a target at a distance of over 100m.
Play 1 Bug Mission.
Kill 150 enemies during the same mission.
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.
Kill 100 enemies using fire damage during the same mission.
Be injured in all limbs at the same time.
Shoot off both arms on a Hulk and then extract while it's alive.