Here is the full list of all 22 LIT: Bend the Light trophies - there are 6 bronze, 8 silver, 7 gold and 1 platinum.
Collect all trophies
Solve all levels
Find 25% of all solutions
Find 50% of all solutions
Find 75% off all solutions
Find all solutions the devs planned
Find all solutions the devs planned and at least one more
Find an alternative solution for a level
Find all solutions for a level with at least 3 possible solutions
Accumulate 100 light beam bounces across all your solutions
Accumulate 500 light beam bounces across all your solutions
Accumulate 1000 light beam bounces across all your solutions
Find more solutions than the devs in at least one level
Solve a previously skipped level
Solve level 4 without using the side mirror (2 glass pieces)
Solve level 6 using 2 or less mirrors (rotation intro)
Solve level 9 by hitting all the movable objects (tick tack toe)
Solve level 11 letting the light bounce at least 25 times (big round mirror)
Solve level 11 not using the mirrors counterclockwise and without skipping any (big round mirror)
Solve level 12 using only one mirror (3 movable concave mirrors)
Solve level 12 using one of the mirrors twice (movable concave mirror)
Solve Level 27 with more than 2 bounces