Here is the full list of all 18 Planet 1138 achievements.
Completed Tutorial Mission
Completed mission Gravel Canyon
Completed mission Squirrel Valley
Completed mission Raptor Bay
Completed mission Mount Nymm
Completed mission TK Reservoir
Completed mission Chard Passage
Completed mission Sheen River
Completed mission Seven Spirits Divide
Completed mission XXS Enclosure
Completed mission Griphyn Corners
Completed mission Shepard Wasteland
Completed mission Dwiggity Lakes
Completed mission Mason Plateau
Completed mission Lone Smoke Ridge
Completed mission Phantom Desert
Completed mission Spider Islands
Completed mission Badman Tundra