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