Full list of all 10 Song of the Deep achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox One.
Purchase all upgrades
Destroy the Forbidden City forever
Feed the Queen Leviathan
Commune with the giant seahorse
Defeat the Fomori Boss
Activate the Deeplight
Kill a Tremorclaw Crab as Merryn
Pay your respects to the Watcher and drop a flower on her final resting place.
Defeat the Watcher
Meet the Merrow