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 a Charger with a resupply pod.
Kill 100 enemies using fire damage during the same mission.
Complete at least 100 missions.
Extract with at least 15 common samples.
Reach max level on one ship module.
Complete an Extreme difficulty mission or higher without anyone dying.
Upgrade all ship modules at least 1 level.
Defeat a Hulk.
Play a planet defense mission.
Throw back a live grenade.
Play 1 Bot Mission.
Play at least 50 missions.
Fire at least 150 rounds in one burst, killing at least 10 enemies.
Kill 5,000 enemies.
Extract at least 15 rare samples from a mission as a team.
Kill 25 enemies with one stratagem.
Defeat a Bile Titan
Complete 10 tactical objectives.
Complete a mission but fail to extract.
Kill a bug warrior with a shotgun within 1 meter.
Customize your Helldiver with new cape, armor, and helmet.
Extract after the timer reaches zero.
Heal another player using stims.
Fly at least 25 meters from the shockwave of an explosion.
Kill a target at a distance of over 100m.
Extract from a mission during nighttime.
Extract with a full team on a Hard difficulty or more mission.
Play 1 Bug Mission.
Kill 150 enemies during the same mission.
Complete a Stalker Hive tactical objective.
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.
Have 6 orbital barrage stratagems in the same place at the same time.
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.