Here is the full list of all 40 Crossovers by POWGI (EU) trophies - there are 26 bronze, 9 silver, 4 gold and 1 platinum.
Collect all the trophies
Solve every puzzle
Find a missing letter "Q"
Find a missing letter "X"
Find a missing letter "J"
Find a missing letter "Y"
Unscramble words that are not the answer ten times
You spelled it wrong
Find a missing letter "F"
Completely miss the point of an anagram-based clue
Find a missing letter "B"
Find a missing letter "G"
Find a missing letter "T"
Find a missing letter "H"
Find a missing letter "V"
Find a missing letter "M"
Find a missing letter "W"
Find a missing letter "K"
Find a missing letter "L"
Find a missing letter "R"
Find a missing letter "A"
Find a missing letter "Z"
Find a missing letter "C"
Find a missing letter "O"
Spend at least a minute considering a solution
Try five different wrong answers for the same clue
Try an answer that isn't even a word
Unscramble three other words before solving a clue
Try the same wrong answer twice
Unscramble a word that isn't the answer
Anagrams, huh?
Find a missing letter "N"
Find a missing letter "P"
Find a missing letter "E"
Find a missing letter "S"
Find the correct letter on only the fourth attempt
Find a missing letter "I"
Solve a puzzle without making a single mistake
Find a missing letter "U"
Find a missing letter "D"