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