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