Here is the full list of all 47 Splasher achievements worth 1,000 gamerscore.
Give yourself to the Dark Side
A good Potatrooper is a drowned Potatrooper!
Rescue all 154 Splashers in Standard mode
Lasers are my calling card
Off to a flying start
A good Potatrooper is a dead Potatrooper!
You rang milord?
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.
Complete the game in Standard mode
Rescue all the Splashers from a level in Standard mode
Complete a level without dying
You should have held that door!
I get knocked out, but I get up again!
A friend in need is a friend indeed
It's all going splendidly
You're never going to keep me down!
A bird with two stones
All in a good cause
Why is it always me?
Jump and you're history
A close shave
Big Bounce Theory : Complete the level without jumping
At least I'm not the only one
Right time, right place
Two Splashers in the same place? Impossible.
Get your first Medal in Time Attack
Get your first Gold Medal in Time Attack
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
Complete all the quarantine areas