Immortals Fenyx Rising

This achievement unlocks when you obtain the final Heroic Gift. You DO NOT have to purchase all of the upgrade nodes. While almost all of these are story related, there are 3 abilities you'll need to obtain via a side quest that appears in each of the island's branches. While these are technically not story-related, you will most likely come across them as they have a giant blue exclamation mark that appears on your mini-map. Note that while there are other side quests with this icon, they do not give you abilities.

The quests you want are given to you by a Nymph, and they will always have you slay "Big Bads". This will lead you to 2 boss fights in the respective island's branch. Returning to the Nymph will give you the ability.

The left branch's (Volcano) Nymph spawns in the upper left section. You get Camouflage.

The middle branch's (Forest) Nymph is near the bottom of the branch. You get a Nature's Fury.

The right branch's (Mountain) Nymph is around the bottom center. You get the Sprint ability.