Here is the full list of all 11 Lucid achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Clear the last level (55th).
Clear 24 RED blocks in consequent moves.
Clear 35 levels.
Get 400,000 or more points in one move.
Over 10 million points in the first level.
Have 8 Lucid-Blocks on the screen at the same time.
Clear 60 YELLOW blocks in one level.
Task-Combo of 14 or over.
Clear 6 GREEN areas in a row.
Clear 18 BLUE blocks in consequent moves.
Clear 5 levels.