Here is the full list of all 23 Seed of Life achievements.
Push 50 shadows
Light up 10 lamps
Activate the second seed and save lumia
Push 20 shadows
Interact with 50 lumium plants
Travel for 20km
Regenerate 5,000 life
Raise talisman capacity to 1,500 Lumium
Interact with 5 alien landmarks
Activate the first seed
Interact with 5 special lumium plants
Regenerate 2,000 life
Travel for 10km
Raise talisman capacity to 1,000 Lumium
Regenerate 100 life
Raise talisman capacity to 500 Lumium
Interact with 1 lumium plants
Raise talisman capacity to 100 Lumium
Push 1 shadow
Meet Nar for the first time
Travel for 1km
Light up 1 lamp
Light up 5 lamps