Here is the full list of all 23 Letter-Setter achievements.
Use 5 letters "А" in one step.
Open all letters in sign language.
Open all letters in Braille language.
Reach max level in all languages.
Have 500 steps in Step-by-Step mode.
Make 500 words in one game.
Make 2.000 words in one game.
Score 100.000 points in one game.
Score 500.000 points in one game.
Score 1.000.000 points in one game.
Destroy 10 words in one step.
Score more than 10.000 points in one step.
Destroy 3 columns in one step.
Destroy 6 columns in one step.
Destroy 2 lines in one step.
Destroy 1 line and 2 columns in one step.
Destroy all the field in one step.