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