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