Here is the full list of all 19 Reverse Crawl trophies - there are 5 bronze, 4 silver, 9 gold and 1 platinum.
You are the best evil Overlord!
Unlock the Iron Golem power
Complete two Sage quests in one campaign
The easiest choice to make
Collect all three of Greybeard's books in one campaign
Achieve the evil ending
Unlock the Red Dragon power
Complete two Hero Party quests in one campaign
Complete two Merchant quests in one campaign
The cruellest choice to make
Achieve either of the good endings
Recruit Bonehead the Goblin Shaman
Unlocked the Horned Demon power
Recruit Greybeard the Exiled Mage
The hardest choice to make
Complete Chapter 7
Defeat a hero
Recruit Violet the Dark Elf
Trigger an Evil Power