Here is the full list of all 20 Pocket Idler: Fishing Pond achievements.
Drop your first fish into the pond.
Fill your pond with the max capacity fully leveled.
Upgrade ponds capacity.
Fully upgrade the ponds capacity.
Upgrade the rod once.
Upgrade the bait once.
Build the Fish Stand.
Purchase the Fishing Sign.
Rent out your first gear.
Have a customer catch a fish.
Fully upgrade the Fish Stand.
Purchase all decorations.
Purchase all rod upgrades.
Purchase all bait upgrades.
Unlock and stock the final fish.
Unlock all upgrades and fully stock the pond with the final fish.
Reach 100% popularity.
Get a thumbs up from a Fisher People.
Get a thumbs down from a Fisher People.
Unlock all achievements.