Here is the full list of all 32 Solar Ash achievements.
Destroy the Remnant in the Broken Capital
Collect 5000 Plasma
Kill 5 enemies in under 5 seconds
Find 5 of Tarragon Danderpaw's lost journals
Locate Cyd in the Broken Capital
Destroy the Remnant in the Crater
Collect 1 Voidrunner Stash
Collect 1000 Plasma
Activate Cyd
Destroy the Remnant in Ironroot Basin
Destroy the Remnant in the Eternal Garden
Destroy the Remnant in the Mirrorsea
Destroy the Remnant in the Luminous Peak
Locate Cyd in Ironroot Basin
Locate Cyd in the Eternal Garden
Locate Cyd in the Mirrorsea
Locate Cyd in The Luminous Peak
Fully power the Starseed
Destroy the Starseed and free Echo
Activate the Starseed
Complete Lyris' Quest
Complete Ames' Quest
Complete Ahrric's Quest
Complete all NPC quests
Complete the game in under 3 hours
Kill 3 enemies without touching the ground
Remain airborne for 10 seconds
Collect 10000 Plasma
Collect all Voidrunner Stashes
Find all of Tarragon Danderpaws' lost journals
Complete the game on Hardcore Mode
Attain 100% completion on a save file