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