The 2-star difficulty rating is more for the game's time consumption, as you'll be looking at roughly 35-45 hours of gameplay. Aside from one missable trophy, the game includes a chapter select to help mop-up what you're missing. Also, no difficulty-related trophies, which means you have the option to play on Casual mode.

Also, take note that the online servers were shut down on May 31, 2014. This means that the co-operative campaign and crucible maps are no longer available. However, this does not affect the trophies, and so the Platinum is still obtainable.

Overall, not a difficult game. Just needs some time to earn the Platinum.

There is no trophy related to difficulty setting, so go ahead and play on Casual if you're in a rush for that platinum. Also, take note of one missable trophy, Above The Influence, in which neither player drank Sleg throughout the game. Sleg is first introduced in Chapter 2. So long as you don't drink it during your initial playthrough, you're fine.

Also, don't ever select New Game+, as it will erase all your hard work, particularly for those trophies which are accumulative. Instead, always use the chapter select.

As you can first select which character to begin with, we found E'lara to be easier, with her speed and ability to attack enemies from afar. But of course, the choice is yours. During your playthrough, there are a number of collectibles to be looking out for. Check out one of the collectible guides under our Links tab.

Also, there are chapter-related challenges, one for each. Make sure to check out the Hunted The Demons Forge trophy guide links under our Links tab to see what you should be doing. However, keep in mind that there is a chapter select later on, if you don't feel like worrying about it now.

Once that's finished, you can use the chapter select and fight each boss again, this time using whichever of the two characters you haven't completed the game with, to unlock their related trophies. Also, now that you've unlocked the Above The Influence trophy, it's now time to drink that Sleg before fighting the final boss, in order to unlock the Piddlin' In The Porridge trophy.

After that, you can use the chapter select to mop-up any other trophies that you're still missing.

Finally, there are the Crucible-related trophies. This includes creating your own map, completing a 25-room map, and finally collect 190,000 gold in total.

First, here's a Walkthrough by CJ Miozzi:
http://www.gamefront.com/hunted-the-demons-forge-walkthrough/

wcrobars has a text-based Walkthrough here:
http://www.cheatcc.com/ps3/sg/hunted_the_demons_forge.txt

Here's a fantastic Trophy Guide by trophybot, which includes all the collectibles:
http://ps3trophies.com/forums/showwiki.php?title=PS3-Trophy-Guides:Hunted:-The-Demons-Forge-Trophy-Guide

yewjhin has a great Trophy Guide here:
http://www.playstationtrophies.org/game/hunted-the-demons-forge/guide/

And a useful Trophy Guide by Josh Romero:
http://www.videogamesblogger.com/2011/05/31/hunted-the-demons-forge-achievements-and-trophies-list-xbox-360-ps3.htm

Another useful Trophy Guide, this one by ExtremeMMOgamer:
http://extrememmogamer.blogspot.jp/2011/07/hunted-demons-forge-achievementtrophy.html

And an Achievement Guide (same as the trophies on PS3) by lDiivil & troy0891:
http://www.xboxachievements.com/game/hunted-the-demons-forge/guide/

Here's a Collectibles Guide by IDiivil:
http://www.xboxachievements.com/forum/showthread.php?t=313727

Finally, here's a basic Trophy List:
http://www.allps3trophies.com/retail-games/hunted-the-demons-forge-trophies.html