Here is the full list of all 22 Crypt of the Serpent King trophies - there are 6 bronze, 8 silver, 7 gold and 1 platinum.
Unlock all other trophies
Collect all the keys and defeat the boss in Level 7 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 6 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 5 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 4 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 3 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 2 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 1 on Hard Difficulty.
Collect all the keys and defeat the boss in Level 7 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 6 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 5 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 4 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 3 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 2 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 1 on Normal Difficulty.
Collect all the keys and defeat the boss in Level 7 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 6 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 5 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 4 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 3 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 2 on Easy Difficulty.
Collect all the keys and defeat the boss in Level 1 on Easy Difficulty.