Here is the full list of all 43 Tetris Effect: Connected achievements.
Earn 100 avatars.
Rotate Tetriminos 100,000 times.
Clear 18 Lines or more in a single Zone visit.
Earn A Rank or higher in all Effect Modes.
Achieve Player Level 50.
Earn a 10 Combo.
Earn SS Rank 10 times.
Earn 100 T-Spins.
Earn 100 All Clears.
Earn 500 Back-to-Backs.
Earn 10 All Clears.
Clear 10,000 Lines.
Clear 1000 Lines total across all Zone visits.
Earn 500 Tetris Line Clears.
Achieve Player Level 30.
Earn A Rank or higher in all Areas of Journey Mode.
Earn your first SS Rank.
Earn 10 Back-to-Backs in a row.
Enter the Zone for more than 10 minutes total.
Earn 50 Back-to-Backs.
Clear 1,000 Infected Blocks in Purify mode.
Discover a land of golden Tetriminos.
Participate in a Weekly Ritual.
Complete all Areas of Expert Journey Mode.
.noisnemid desrever gniyonna na ni yalP
Witness a meteor shower in Countdown mode.
Play Marathon, Ultra and Sprint modes.
Clear Ambient: Sea, Wind, and World modes.
Earn 100 Tetris Line Clears.
Clear 12 Lines or more in a single Zone visit.
Earn 10 T-Spins.
Achieve Player Level 10.
Activate the Zone mechanic.
Complete all Areas of Journey Mode.
Clear 1000 Lines.
Complete Area 4 of Journey Mode.
Earn 10 Tetris Line Clears.
Complete Area 1 of Journey Mode.
Clear 100 Lines.
Earn all achievements.
Achieve Player Level 100.
Earn a 15 Combo.
Earn S Rank everywhere possible.