Tetris Ultimate

Get ready for a grind :(

As with the other achievements in the game, you must complete three badges to earn the Dedicated badge, which will then pop this achievement.

Longevity: "Clear 20,000 lines"

This can be tracked in Progress -> Stats. It's your Total Lines under Cumulative stats. Just ignore this one as you'll go well beyond 20,000 lines as you work towards Crushed it! (and especially Show-off for the Tetris Master achievement)

Crushed it!: "Complete 15,000 Tetris line clears"

This also can be tracked in Progress -> Stats. For the mathematically impaired, 15,000 Tetris line clears is 60,000 lines, which is well beyond the 20,000 you need for Longevity.

Note: If you want to complete this game, I suggest finding a boosting partner and playing Endless against them over and over and over- like 500 times- as you work towards this, Longevity, and the Show-off badge for the Tetris Master achievement as you need to clear 100,000 lines in online play :(

Mt Olympus: "Complete Marathon mode"

Just complete Marathon mode by reaching 150 lines.