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