Here is the full list of all 37 Red Dead Hentai Horse achievements.
Reach the Sun
Reach the Mercury
Reach the Venus
Reach the Moon
Reach the Phobos
Reach the Deimos
Reach the Mars
Achieve 1000 score points
Keeps you alive
Reach the Europe
1000 oxygen
Achieve 900 score points
900 oxygen
Achieve 800 score points
800 oxygen
Achieve 700 score points
Reach the IO
700 oxygen
Achieve 600 score points
Reach the Jupiter
600 oxygen
Reach the Saturn
Achieve 500 score points
500 oxygen
Reach the Uranus
Achive 400 score points
400 oxygen
Reach the Neptune
Achieve 300 score points
300 oxygen
Achieve 200 score points
250 oxygen
200 oxygen
Achieve 100 score points
100 oxygen
Start your Journey
Reach the Pluto