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