Here is the full list of all 20 NyxQuest: Kindred Spirits achievements.
Find all the hidden relics
Get all Time Challenge achievements
Secret Level finished in less than 8:30
You have discovered and finished Arcadia
Level 11 finished in less than 5:00
Level 12 finished in less than 8:00
Level 10 finished in less than 6:45
Level 9 finished in less than 9:00
Level 8 finished in less than 6:30
Level 7 finished in less than 5:30
Level 6 finished in less than 5:30
Level 5 finished in less than 4:45
Level 4 finished in less than 7:30
Level 3 finished in less than 8:00
Level 2 finished in less than 3:15
Level 1 finished in less than 4:45
Find Icarus
Get the power of Ray Casting
Get the Power of Winds
Get the power of Telekinesis