Shelldiver Steam Achievement Guide: All 13 Achievements

If Grandpa Turtle reached the submarine with one blue sliver of oxygen left, you have already met Shelldiver’s favorite rhythm: scrape home, sell the haul, and buy enough power to make the next dive look easy. Steam’s 13 achievements follow that same climb from the first 100m trip to one very well-earned nap.

Shells are the main money earned by selling jellyfish. Prestige is a progress rank raised through skill purchases; it opens new areas instead of resetting your run. The exact Steam achievement text appears below, including the game’s wording for its two hidden descriptions.

All 13 Steam Achievements

Achievement	Exact requirement	How to unlock
100m Depth	Reach the depth of 100 meters	Enter the dive labeled 100m.
400m Depth	Reach the depth of 400 meters	Keep raising Prestige until 400m opens, then enter that dive.
700m Depth	Reach the depth of 700 meters	Open and enter the 700m dive.
1000m Depth	Reach the depth of 1000 meters	Open and enter the 1000m dive.
First 1M	Reach 1,000,000 Shells	Let the current shell balance reach one million.
First 1B	Reach 1,000,000,000 Shells	Let the current balance reach one billion.
First 1T	Reach 1,000,000,000,000 Shells	Let the current balance reach one trillion.
First 1Q	Reach 1,000,000,000,000,000 Shells	Let the current balance reach one quadrillion.
Make a Friend!	Wave to a fellow turtle in the island	Approach another island turtle and use the displayed interaction control.
Ultra Special Rainbow Jellyfish	Capture a rainbow jellyfish	Find the multicolored jellyfish during a dive and capture it with the bubble gun.
Built to Dive	Maxime all skills	Purchase every skill rank and every one-time skill, including the final center upgrade.
Hammock Sleep	Get your well deserved rest	Unlock the hammock repair, repair the hammock on the island, and lie down.
Cleared Island	Get all achievements available	Unlock the other 12 Steam achievements.

Depth and Shell Milestones

The depth achievements use the depth assigned to each dive. You do not have to swim 1,000 meters down from the surface in one heroic oxygen disaster. Buy skills until the next depth opens, select the required dive, and enter it.

For the shell milestones, ease off large purchases when the counter nears 1M, 1B, 1T, or 1Q. Let the visible balance cross the mark before spending again. If you fall short, sell another jellyfish batch and collect the shop’s shells instead of tearing up a useful upgrade plan for pocket change.

Make a Friend!

Return to the island and find another turtle.
Move close enough for the interaction prompt to appear.
Use the control shown by the game to wave.
Wait for the wave interaction to finish and the achievement to unlock.

If a nearby island object catches the interaction instead, move into open ground beside a different turtle and try again.

Ultra Special Rainbow Jellyfish

Raise Prestige and open deeper dives. Deeper water improves the chance of meeting the rare jellyfish, but no dive guarantees one.
Choose the deepest area you can search while keeping enough oxygen for the return trip.
Check the jellyfish near the submarine, then sweep the connected chambers in one direction.
Look for a jellyfish with several bright colors on its body. It does not need to flash or cycle through colors to count.
Use the bubble gun, Shelldiver’s jellyfish-catching weapon, and keep firing until the capture completes.

Movement speed, oxygen, bubble damage, clip size, and reload upgrades make each search smoother. If the rainbow refuses to clock in for turtle business, bank the haul and launch another dive.

Built to Dive

This achievement requires the full skill tree, not merely access to the last depth. Use this final-tree check:

Finish every ordinary skill rank and every visible one-time skill.
Buy the four late buffs that require Scrap, Crystals, Mushrooms, and Obsidian. Revisit Ocean Shallows for Scrap, Glacial Depths for Crystals, the 600m area or Swamp Waters for Mushrooms, and Magma Abyss for Obsidian.
Finish every skill that costs Life Vials.
Purchase all four nodes marked ???. These are separate from the four material buffs and are required to reach the last upgrade.
If the tree stops at 799/800, select the center node and spend 10Q shells on the final skill.

Completing that last skill brings the tree to 800/800 and unlocks Built to Dive.

Hammock Sleep

Finish the skill tree and unlock the hammock repair.
Leave the tree and walk to the far-left side of the island.
Find the cloth hammock hanging between the palm trees near the homes.
Use the displayed prompt to repair the hammock.
Interact with it again and lie down. The rest scene begins and Hammock Sleep unlocks.

Cleared Island and Cleanup

Cleared Island is the final Steam achievement. It unlocks after the other 12. If Hammock Sleep was your last missing entry, Cleared Island follows it; otherwise, compare the list above with Steam’s checklist and repeat the missing task on the same save.

Missability: none was lost on a clean, fully completed save. The four depth milestones, four shell totals, Make a Friend!, and Ultra Special Rainbow Jellyfish can be cleaned up late after their systems are open. Built to Dive and Hammock Sleep sit at the end of progression, while Cleared Island waits for the full set. After the ending, choose Continue to reopen the completed save. Avoid New Game until every achievement has appeared.

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