Here is the full list of all 34 Learn the letters trophies - there are 32 silver, 1 gold and 1 platinum.
Letters Master - Unlock all trophies
Guess 35 incorrect letters
Guess 30 incorrect letters
Guess 25 incorrect letters
Guess 20 incorrect letters
Guess 15 incorrect letters
Guess 10 incorrect letters
Guess 5 incorrect letters
Correctly guess the Z letter
Correctly guess the Y letter
Correctly guess the X letter
Correctly guess the W letter
Correctly guess the V letter
Correctly guess the U letter
Correctly guess the T letter
Correctly guess the S letter
Correctly guess the R letter
Correctly guess the Q letter
Correctly guess the P letter
Correctly guess the O letter
Correctly guess the N letter
Correctly guess the M letter
Correctly guess the L letter
Correctly guess the K letter
Correctly guess the J letter
Correctly guess the I letter
Correctly guess the H letter
Correctly guess the G letter
Correctly guess the F letter
Correctly guess the E letter
Correctly guess the D letter
Correctly guess the C letter
Correctly guess the B letter
Correctly guess the A letter