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