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