Here is the full list of all 33 Ascender achievements.
Finish task AI.R Enlisting
Visit Dolopo
Finish task Scrutinizing Body Function
Fully expand rune slot
Visit Mustang
Visit Everest
Visit Helion
Visit Rajumla
Visit Ranesh
Visit Hymla
Defeat Salatypus
Get an ending of the tree
Get an ending of the stone
Get an ending of hope
Finish task Gotta Catch a Meowl
Finish task Acquiring Titanium
Finish task Dry Out
Finish task A Broken Patella
Finish task Elefix
Finish task Gardener
Finish task Finding Paxton
Finish task Aldrin Thatcher
Finish task Ancient Engraving
Finish task Greedy Xavier
Finish task Runaway Garsel
Finish task Nolamium Metal
Finish task Galvanium Alloy
Finish task Power Sources
Finish task Forty Bars
Finish task Mysterious Rune
Finish task Cattle Pond
Easter egg in AI.R?
Get all 7 developer card