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