Here is the full list of all 39 S.U.B. achievements.
You've beaten the Easy difficulty mode.
You've beaten the Normal difficulty mode.
You've beaten the Hard difficulty mode.
You've beaten the Tutorial mode.
You've survived 1 minute in a round of Endless mode.
You've survived 5 minutes in a round of Endless mode.
You've survived 10 minutes in a round of Endless mode.
You've survived 15 minutes in a round of Endless mode.
You've collected 1 keycard in a round of Endless mode.
You've collected 5 keycards in a round of Endless mode.
You've collected 10 keycards in a round of Endless mode.
You've collected 15 keycards in a round of Endless mode.
You've slain 1 shark in a round of Endless mode.
You've slain 5 sharks in a round of Endless mode.
You've slain 10 sharks in a round of Endless mode.
You've slain 15 sharks in a round of Endless mode.
You've upgraded the shooting station to its highest rank.
You've upgraded the steering station to its highest rank.
You've fully loaded the sonar station to its highest capacity.
You've fully loaded and upgraded all three station in a single round.
You've won a round without fully loading or upgrading any station.
You've won a round without loading any metal into the sonar station.
You've won a round without loading any metal into the healing station.
You've won a round without loading any metal into any station or using the freebie super sonar.
You've won a round without even entering the shooting station.
You've won a round without even entering the sonar station.
No sharks were harmed during the making of this achievement.
You won a round without ever docking into two stations at once (this includes using the scrap station!).
Lose a game due to collision with rocks.
Lose a game due to shark related collisions.
Lose a game due to very Evil laser related shark accidents.
Lose a (Easy/Normal/Hard) game while holding 4 keycards... Ouch...
No one said you had to win the speedrun.
Bring yourself back from the brink of death, several times...
It's time to give those sharks a taste of their own medicine.
You've successfully littered the ship, good job.
You've shared an intimate moment at sea.
But I nééd it.
You've achieved everything there is to S.U.B., congratulations! Thanks for playing ^-^!