| Achievement | How to unlock
|
|---|
| A Hasty Escape | Finish the game in Normal Mode in under 45 minutes.
|
| An Easy Escape | Finish the game on Easy Mode.
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| Artificial Enhancement | Find all the health upgrades.
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| Deep Dweller | Defeat the rock creature in the caverns.
|
| Escape from Tethys | Finish the game on Normal Mode.
|
| Final Encounter | Defeat the IRI Assassin for the last time.
|
| Haywire | Destroy the missile frigate.
|
| Hostile Waters | Destroy the reef guardians.
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| Industrial Sabotage | Encounter the IRI Assassin.
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| Locked and Loaded | Find all the ammo upgrades.
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| Mysterious Planet | Unlock the high-security gate.
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| Rogue Scientist | Put the rogue scientist to rest.
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| Tech Expert | Find every upgrade.
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| Tethys Explorer | Explore every area on Tethys.
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| We Meet Again | Defeat the IRI Assassin for the second time.
|