Here is the full list of all 43 Hammerwatch trophies - there are 27 bronze, 12 silver, 3 gold and 1 platinum.
Kill Krilith on hard difficulty without having any crutches enabled
Kill the Dune Sharks on hard difficulty without having any crutches enabled
Kill the Dragon on hard difficulty without having any crutches enabled
Kill the Lich on hard difficulty without having any crutches enabled
Kill the Knight on hard difficulty without having any crutches enabled
Kill the Queen on hard difficulty without having any crutches enabled
Complete the Temple campaign
Beat both the Castle Hammerwatch and the Temple of the Sun campaigns
Kill Sha'Rand on medium difficulty without having any crutches enabled
Kill Sha'Rand with 2 or more players
Enter and exit the Pyramid of Fear
...is far away from the Green Hill Zone
Seriously?! That's what I got?
It was better in the movie
Kill Krilith on medium difficulty without having any crutches enabled
Daniel the Traveler was here
Kill the Dune Sharks on medium difficulty without having any crutches enabled
Kill 15,000 enemies in the campaign
Survive the castle collapsing
Kill the Dragon on medium difficulty without having any crutches enabled
Kill the Dragon with 2 or more players
Find the fourth easter egg
Get combo kills until you reach 200
Get 75,000 coins in the campaign
Air-walk between the start and the end!
Kill the Lich on medium difficulty without having any crutches enabled
Find the third easter egg
Kill the Knight on medium difficulty without having any crutches enabled
Find the second easter egg
Solve it like it was E1M4
Get 10,000 coins in the campaign
Kill 2,500 enemies in the campaign
Kill the Queen on medium difficulty without having any crutches enabled
Find the first easter egg
Start a Multiplayer Game
Master Hammerwatch in all possible ways
Get 500,000 coins in the campaign
Kill 100,000 enemies in the campaign
Kill the Crystal Lich in the survival level on medium difficulty without having any crutches enabled
Kill the Crystal Lich in the survival level on hard difficulty without having any crutches enabled
Get combo kills until you reach 1000
Kill Sha'Rand on hard difficulty without having any crutches enabled
Kill the Crystal Lich in the survival level with 2 or more players