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