Here is the full list of all 25 Glowfish achievements.
Eliminate 100 enemies by circling them in Chain Mode.
Trap an enemy creature between the moving walls.
Circle a large foe into a friend.
Eliminate 100 enemies in Orbit Mode.
Collect 500 coins.
Locate 10 Secret Areas.
Take 50 friends to safety.
Get a 4-Star Rating in any level.
Defeat Dr. Urchin.
Get a 4-Star Rating in all 50 levels.
No loss of glow on a stage.
Collect 5000 coins.
Upgrade your Glow Chums to maximum capacity.
Get a 4-Star Rating in 10 different levels.
Locate 50 Secret Areas.
Unlock all Glow Chums.
Convert the Corrupted Fighter into a Glow Chum.
Locate 25 Secret Areas.
Finish level 4 without harming any foes.
Win the Darter race with a 4-Star Rating.
Avoid the Angler Fish in the Briny Depths.
Take 500 friends to safety.
Upgrade Scout to maximum.
A perfect win over Dr. Urchin; no loss of glow.
Get a 4-Star Rating on any of the puzzle levels.