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