Tetris Evolution
40 Achievements
1,000
12-15h
Big Ol Cascade
Triggered 8 or more Cascade Line Clears with a single drop.
50
How to unlock the Big Ol Cascade achievement in Tetris Evolution - Definitive Guide
It might take a few tries, but this technique worked well for me. Leave the gap on the bottom left, and leave proper space on the right so you can toss your green pieces to build up your pre-cascade. When you get to a height of four green pieces, long-piece attack it (the line clear piece last) and watch it fly. All of it is shown in the video.
Video credit goes to RDubes.
This can be achieved purely by mistake if you get the grid high enough but there is a better way. Fill the bottom row all the way across barring the far left block (so there is one gap). After that you need to stack 4 green shapes on the right hand side while covering the hole you left. Put a long blue piece on the far right on top of the last green piece. The next long piece goes on the far left and is the key component for the 8th cascade. Be sure not to put anything on top of this or it won't drop down to make the 8th cascade. Then put the last straight line on the left side of the green piece and start the cascade. (Thanks to ZeroDesolation for this). Just make sure you don’t create any lines in the middle of this set up as it will muck it all up.