Here is the full list of all 20 TUNNEL DIVERS achievements.
Complete the training mission.
Complete the training mission with a Superior performance review.
Find the secret in the training mission.
Earn your first million in your career.
Unlock all ships.
Unlock all weapons.
Unlock all modules.
Destroy an enemy from the afterlife.
Crash into 3 enemies using the Rhino's charge in one life.
Win a round of Team Dogfight while you are the last one left.
Complete the campaign.
Complete every campaign mission with a Superior performance review.
Complete the campaign on Ironman mode.
Complete all 3 solo Gauntlet missions.
Download and play a Workshop level from the in-game browser.
Destroy an enemy player who has a quad damage power up.
Defeat the Harrier.
Defeat the Master.
Defeat the Cruiser.
Complete any solo Gauntlet level without building any stations or turrets.