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