Complete the listed task to unlock the corresponding Steam achievement. To view your achievement progress and stats, open the Steam client, select "Community", then search for the game hub for "LinkThe Unleashed Nexus". Choose the "View Stats" option on the drop down list, then choose the option that will list the achievements for your username.

Achievement	How to unlock
A Boundary of the World	Collect 3 Spheres in 3rd stage.
A Reminiscent Scenery	Through "Ocean of the Silence".
A Replica	Collect 3 Spheres in 5th stage.
Awaking	Beat 1st Nexus without "Urgent Ascent".
Close Her Eyes	Beat "CS	Observer".
Fake Deep Sea	Collect 3 Spheres in 1st stage.
Heaven's Linkage	Through the "HeavensLeash", and Broke the Alpha Nexus.
Progressing	Beat 5th Nexus without "Urgent Ascent".
Remembrance	Beat 4th Nexus without "Urgent Ascent".
Rising Consciousness	Began the R.E.M.
Rising	Beat 2nd Nexus without "Urgent Ascent".
Seeking	Beat 3rd Nexus without "Urgent Ascent".
Stray Memories	Collect 3 Spheres in 6th stage.
Sunken Truth	Through the shrine and Reach to top of the "HAVEN".
The Liberator	Beat the 1st Nexus.
The Memory Storage	Collect 3 Spheres in 4th stage.
The Observer	Collect 3 Spheres in 2nd stage.
The Unleashed Nexus	Returned from the "HAVEN". But maybe you're still in bind.
The Unleashed One	Escaped from "The Nexus". But you're still in bind.
Unbound	Beat Alpha Nexus without "Urgent Ascent".
Urgent Agent	Used "Urgent Ascent" many times.