Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Academic (23 points)	Finish Chapter II.
Aftermath-Inverter (11 points)	Complete The Aftermath with 2 inversions.
Bridgewalker (23 points)	Cross The Bridge.
Catcher (11 points)	Catch the unchained key in The Mirrored Courtyard.
Challenger (23 points)	Finish Chapter IV.
Collector (19 points)	Collect all hidden wisps.
Corridor-Inverter (13 points)	Complete The Corridor with 3 inversions.
Garden-Inverter (13 points)	Complete The Mirrored Garden with 5 inversions.
Genius (31 points)	Finish Mirrored Chapter IV.
Heretic (29 points)	Finish Mirrored Chapter I.
Hermit (31 points)	Finish Mirrored Chapter III.
Outcast (29 points)	Finish Mirrored Chapter II.
Plummeter (7 points)	Fall for 30 seconds.
Refrainer (17 points)	Complete The Precipice without rotating.
Runner (7 points)	Complete The Timepiece in less than 1 minute.
Scholar (23 points)	Finish Chapter III.
Slider (17 points)	Complete The Intersection without walking.
Thinker (23 points)	Finish Chapter I.
Visionary (31 points)	Complete all mirrored worlds.
Whisperer (19 points)	Complete The Library being no louder than a whisper.