The Rightful Place trophy / achievement in God of War Ragnarok is unlocked once you capture and return all of the Lost Lindwyrms to Ratatoskr. This forms part of The Lost Lindwyrms favor which can be acquired from Ratatoskr outside Sindri’s House in the Realm Between Realms, but only after you’ve killed Nidhogg during The Reckoning main quest.

Rightful Place

Return all the Lindwyrms to Ratatoskr