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