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 35 levels.
Over 10 million points in the first level.
Get 400,000 or more points in one move.
Have 8 Lucid-Blocks on the screen at the same time.
Task-Combo of 14 or over.
Clear 24 RED blocks in consequent moves.
Clear 18 BLUE blocks in consequent moves.
Clear 5 levels.
Clear 6 GREEN areas in a row.
Clear 60 YELLOW blocks in one level.