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