Here is the full list of all 12 Watchmen: The End Is Nigh trophies - there are 7 bronze, 4 silver and 1 gold.
Complete the game in less than 80 minutes, in one session without restarting from a checkpoint.
Complete the game in co-op mode.
Eliminate 20 bad guys in 101 seconds.
Go unharmed for an entire level, without restarting from a checkpoint.
Complete the game in Nite Owl mode.
Find all abilities and pick-ups in Nite Owl mode.
Find all abilities and pick-ups in Rorschach mode.
Knock 100 people over, by throwing other people into them.
Complete the game in Rorschach mode.
Perform 250 finishing moves.
Perform 200 counter attacks.
Dodge or block 25 incoming attacks.