Shelldiver

1. 
   Built to DiveSecret

   Steam withholds the description of a secret achievement.
   69%
2. 
   Hammock SleepSecret

   Steam withholds the description of a secret achievement.
   69%
3. 
   100m Depth

   Reach the depth of 100 meters
   99%
4. 
   400m Depth

   Reach the depth of 400 meters
   85%
5. 
   700m Depth

   Reach the depth of 700 meters
   78%
6. 
   1000m Depth

   Reach the depth of 1000 meters
   74%
7. 
   Make a Friend!

   Wave to a fellow turtle in the island
   78%
8. 
   Ultra Special Rainbow Jellyfish

   Capture a rainbow jellyfish
   72%
9. 
   First 1M

   Reach 1,000,000 Shells
   80%
10. 
    First 1B

    Reach 1,000,000,000 Shells
    75%
11. 
    First 1T

    Reach 1,000,000,000,000 Shells
    73%
12. 
    First 1Q

    Reach 1,000,000,000,000,000 Shells
    71%
13. 
    Cleared Island

    Get all achievements available
    68%

Names, descriptions and icons are the game’s own, as Steam publishes them; the share is how many owners have unlocked each, from Steam's global figures for 13 of them.