Shelldiver Achievement Guide
Shelldiver Achievement Guide

Update Datetime: 2026-09-14 08:26
ACHIEVEMENTS
Shelldiver Achievement Guide
All 13 achievements, the two hidden ones explained, and where players find the rainbow jellyfish.
Total
13
Hidden
2
Missable
None
100 percent
About 4 h

Shelldiver is one of the rare games where most players who start it go on to earn every achievement. The list is short, nothing can be locked out, and all of it follows from simply playing and upgrading. Names and descriptions below come from the official Steam achievement list. Two achievements hide their descriptions on Steam, and for those the conditions come from a community achievement guide.

1 The full list

AchievementCondition
100m DepthReach a depth of 100 meters
400m DepthReach a depth of 400 meters
700m DepthReach a depth of 700 meters
1000m DepthReach a depth of 1000 meters
First 1MReach 1,000,000 Shells
First 1BReach 1,000,000,000 Shells
First 1TReach 1,000,000,000,000 Shells
First 1QReach 1,000,000,000,000,000 Shells
Ultra Special Rainbow JellyfishCapture a rainbow jellyfish
Make a Friend!Wave to a fellow turtle on the island
Hammock SleepHidden. Rest in a hammock after diving
Built to DiveHidden. Max out every skill
Cleared IslandGet all other achievements

2 The four depth achievements

Depth unlocks at 100, 400, 700 and 1000 meters. None of them needs a special route. They are gated by equipment, so each one arrives once your submarine and oxygen upgrades can take you that far and bring you back.

The depth achievements pay for themselves
Reviewers note that deeper jellyfish are worth significantly more. Chasing the next depth marker is also the fastest route to the Shells milestones, so the two groups reinforce each other.

3 The four Shells milestones

Shells are the currency, and the milestones jump by a factor of a thousand each time: a million, a billion, a trillion and a quadrillion. That looks daunting written out, but it is the nature of an incremental game. Income multiplies as you upgrade, so the gap between the last two milestones closes far faster than the numbers suggest.

No separate effort
Shells are earned by selling your catch, so these unlock as a side effect of normal play.
Depth multiplies income
Deeper jellyfish are worth more, so progress toward depth also speeds up these milestones.
If one lags
Spend on upgrades that raise income rather than grinding the same shallow dive.

4 Ultra Special Rainbow Jellyfish

The only achievement tied to a single rare creature. The official description simply says to capture a rainbow jellyfish. A community achievement guide adds that it appears rarely in the deep ocean, in the bioluminescent regions usually beyond about 600 meters. That location is a player report rather than an official statement, but it fits the pattern that the most valuable jellyfish live deepest.

✓
Do not farm it early Shallow dives will not find it. Keep progressing as normal, and it will turn up while you are working toward the 700 and 1000 meter achievements anyway.

5 Island achievements and the hidden two

Three achievements have nothing to do with how good your dives are, which is exactly why they get overlooked.

AchievementWhat to do
Make a Friend!On the island, wave to another turtle. You can do this at any time.
Hammock SleepHidden on Steam. The community guide describes finding a hammock and resting in it after a long day of diving.
Built to DiveHidden on Steam. The community guide describes it as maxing out every skill to its full level.

Built to Dive is effectively the end of the game. A community answer on the Steam forums notes that the question mark nodes in the tree must all be unlocked before the final upgrade becomes available, so buy those rather than skipping them.

6 Cleared Island

The completion achievement unlocks once every other one is earned. If it has not appeared after you finish the skill tree, check the two island achievements and the rainbow jellyfish first, since they are the only ones that do not follow automatically from upgrading and diving deeper.

7 A sensible order

1
Right away
Wave to a turtle for Make a Friend!, then look around the island for the hammock.
2
Early game
100m and 400m depth, First 1M and First 1B come naturally.
3
Mid game
Push to 700m, watch for the rainbow jellyfish in deep water, and reach First 1T.
4
End game
1000m, First 1Q and every skill maxed for Built to Dive, which completes Cleared Island.
Summary

Shelldiver has 13 achievements, none missable, and about four hours is enough for all of them. Four come from depth at 100, 400, 700 and 1000 meters, and four from Shells at a million, a billion, a trillion and a quadrillion. Players report the rainbow jellyfish in deep bioluminescent water beyond about 600 meters. Wave to a turtle and find the hammock on the island, unlock every question mark node on the way to maxing the skill tree for Built to Dive, and Cleared Island follows.

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