Here is the full list of all 47 Splasher achievements.
You rang milord?
Complete all the quarantine areas
Right time, right place
You're never going to keep me down!
Get your first Gold Medal in Time Attack
Get your first Medal in Time Attack
Why is it always me?
Give yourself to the Dark Side
Complete a level without dying
A good Potatrooper is a drowned Potatrooper!
Two Splashers in the same place? Impossible.
Get Bouncink
A bird with two stones
Mashed Potatroopers
Lasers are my calling card
A close shave
Off to a flying start
You should have held that door!
At least I'm not the only one
Fries anyone?
I get knocked out, but I get up again!
A good Potatrooper is a dead Potatrooper!
Get Water Stickink
All in a good cause
A friend in need is a friend indeed
It's all going splendidly
Rescue all the Splashers from a level in Standard mode
Get Water
Jump and you're history
Complete the game in Standard mode
Rescue all 154 Splashers in Standard mode
Go Splashteam
Complete a level without jumping
699
Get your first Platinum Medal in Time Attack
Complete a Selfish Speedrun
Complete a Standard Speedrun
Complete a Gotta Catch'em All Speedrun
Get your first Medal in Speedrun
Get your first Gold Medal in Speedrun
Get your first Platinum Medal in Speedrun
Complete a Speedrun without dying a single time
Get all the Bronze Medals in the game
Get all the Silver Medals in the game
Get all the Gold Medals in the game
Get all the Platinum Medals in the game
Get all the Achievements. After that, you are definitely one of the best players on the planet, perhaps even the best ever! Continue to prove it in the leaderboards!