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