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