Here is the full list of all 44 Kerbal Space Program achievements worth 1,000 gamerscore.
You've planted your first flag on the Mun!
You've completed your first EVA on the Mun.
Congratulations! You completed your first mission to the Mun.
You've recovered your first crew member from the perils of space!
Congratulations! You completed your first flyby of Minmus.
You've completed a flyby of the Mun!
Congratulations! You've completed your first contract!
You've launched your first satellite into space! Now you can join the leagues of the Sputnik I team.
You've completed your first landing at the Kerbal Space Center!
You've been to space and landed safely back home!
Your first EVA in space! Now you've joined the leagues of those who repaired the Skylab in 1973.
You've completed your first Launch Pad launch.
You've completed your first runway launch!
Install a docking port and dock onto another vessel.
Make a rover and take it out for a ride!
Complete a flyby of Eeloo.
Complete a landing on Moho.
Complete a flyby of Bop.
Complete a flyby of Dres.
Complete a flyby of Duna.
Complete a flyby of Eve.
Complete a flyby of Gilly.
Complete a flyby of Ike.
Complete a flyby of Jool.
Complete a flyby of Kerbin.
Complete a flyby of Laythe.
Complete a flyby of Moho.
Complete a flyby of Pol.
Complete a flyby of Tylo.
Complete a flyby of Vall.
Complete a mission to Bop.
Complete a mission to Dres.
Complete a mission to Duna.
Complete a mission to Eeloo.
Complete a mission to Eve.
Complete a mission to Gilly.
Complete a mission to Ike.
Complete a mission to Jool.
Complete a mission to Laythe.
Complete a mission to Minmus.
Complete a mission to Moho.
Complete a mission to Pol.
Complete a mission to Tylo.
Complete a mission to Vall.