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