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.
Kill 25 enemies with one stratagem.
Extract at least 15 rare samples from a mission as a team.
Play at least 50 missions.
Kill 5,000 enemies.
Defeat a Bile Titan
Kill 100 enemies using fire damage during the same mission.
Extract with at least 15 common samples.
Heal another player using stims.
Complete a Stalker Hive tactical objective.
Provide assisted reload for a teammate.
Complete 10 tactical objectives.
Kill 150 enemies during the same mission.
Extract with a full team on a Hard difficulty or more mission.
Extract after the timer reaches zero.
Extract from a mission during nighttime.
Kill a bug warrior with a shotgun within 1 meter.
Be injured in all limbs at the same time.
Kill a target at a distance of over 100m.
Defeat a Hulk.
Complete a mission but fail to extract.
Fly at least 25 meters from the shockwave of an explosion.
Throw back a live grenade.
Customize your Helldiver with new cape, armor, and helmet.
Play 1 Bug Mission.
Play 1 Bot Mission.
Play a planet defense 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.
Complete at least 100 missions.
Have 6 orbital barrage stratagems in the same place at the same time.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Reach max level on one ship module.
Upgrade all ship modules at least 1 level.
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.