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