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