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.
Throw back a live grenade.
Kill 100 enemies using fire damage during the same mission.
Complete an Extreme difficulty mission or higher without anyone dying.
Complete at least 100 missions.
Upgrade all ship modules at least 1 level.
Reach max level on one ship module.
Shoot off both arms on a Hulk and then extract while it's alive.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Play a planet defense mission.
Be injured in all limbs at the same time.
Complete a mission but fail to extract.
Kill 25 enemies with one stratagem.
Play at least 50 missions.
Kill 5,000 enemies.
Kill a bug warrior with a shotgun within 1 meter.
Defeat a Bile Titan
Extract at least 15 rare samples from a mission as a team.
Kill a target at a distance of over 100m.
While using a jump pack, knock yourself into a ragdoll state.
Extract with a full team on a Hard difficulty or more mission.
Complete 10 tactical objectives.
Complete a Stalker Hive tactical objective.
Play 1 Bot Mission.
Extract after the timer reaches zero.
Extract from a mission during nighttime.
Extract with at least 15 common samples.
Fly at least 25 meters from the shockwave of an explosion.
Heal another player using stims.
Defeat a Hulk.
Customize your Helldiver with new cape, armor, and helmet.
Play 1 Bug Mission.
Kill 150 enemies during the same mission.
Provide assisted reload for a teammate.
Complete Basic Training.
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.