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