The 3-star rating is for two reasons. One, is that playing on Hard mode is no walk in the park, and you will face some pretty frustrating areas. Second, is for the online trophies which, if earning them legitimately, can be a real grind and difficult at times. With a group of 4 boosting partners, the online trophies will certainly prove quicker and easier to unlock, yet still only bringing this rating from a high 3-star to a low 3-star.

If you're playing without boosting partners, expect well over 120 hours of gameplay.

The game is technically two in one, with Escape from Butcher Boy included in the Assault on Dark Athena, which means there are two campaigns to get through. Trophy-wise, it doesn't matter which game you play first. But if you're interested in the story, we recommend obviously starting with Escape from Butcher Bay.

Hard difficulty is available from the start, and so if you're in a rush for that Platinum, we recommend playing on that through both campaigns. Half of the offline trophies are story related, while the others involve either finding collectibles in the form of cigarette packs, and a few other miscellaneous ones. You can reload checkpoints at any time, so technically nothing is missable. However, Ring Fight Champion will require you to take the fighting path towards Abbott. Also, you'll need to unlock the Gabril trophy before you can find the sniper rifle to unlock the Sniper Master trophy. Finally, make sure you complete all the side missions throughout the Butcher Bay campaign in order to unlock the Bell Boy trophy.

Once you've finished all the offline trophies, it's time to head into multiplayer to get those 18 online trophies. If you're planning on boosting, there are a few requirements which need a total of 4 players. However, the majority of them can be done with only one boosting buddy. Check out both the trophy guides under our Links tab to see which trophies require how many players, and the boosting forums if you're in search of a boosting partner. Of course, these trophies can be done legitimately as well, though will require some skills and a whole lot of grinding.

A text-based Walkthrough for Butcher Bay, by From Earth and Bob3739:
http://www.gamefaqs.com/pc/921671-the-chronicles-of-riddick-escape-from-butcher-bay/faqs/49189

And a text-based Walkthrough for Dark Athena by RARusk:
http://www.gamefaqs.com/ps3/939613-the-chronicles-of-riddick-assault-on-dark-athena/faqs/56599

switchfreak83 has a great Trophy Guide here:
http://www.playstationtrophies.org/game/the-chronicles-of-riddick-assault-on-dark-athena/guide/

And a great Trophy Guide here, by trophybot:
http://ps3trophies.com/forums/showwiki.php?title=PS3-Trophy-Guides:The-Chronicles-of-Riddick:-Assault-on-Dark-Athena-Trophy-Guide

And a simple Trophy Guide by Josh Romero:
http://www.videogamesblogger.com/2011/01/27/the-chronicles-of-riddick-assault-on-dark-athena-achievements-and-trophies-guide-xbox-360-ps3.htm

A video demonstration of the Stealth Master trophy, by Overlord73:
https://www.youtube.com/watch?v=tQR_VORuN04

And a video demonstration of the Master Of Drones trophy, by judasen:
https://www.youtube.com/watch?v=ii7SiGZvRIQ

A Bounty Hunter Cards Collectible Guide, by madcap1:
http://www.xbox360achievements.org/forum/showthread.php?t=141438

Here's a Boosting Forum on PlaystationTrophies:
http://www.playstationtrophies.org/forum/chronicles-of-riddick-assault-on-dark-athena/10043-trophy-boosting-thread-read-first-post.html

And a Boosting Forum on PS3Trophies:
http://ps3trophies.com/forums/chronicles-riddick-assault-dark-athena/1586-offical-chronicles-riddick-assault-dark-athena-boosting-thread.html

Finally, here's a basic Trophy List:
http://psnprofiles.com/trophies/83-The-Chronicles-of-Riddick-Assault-on-Dark-Athena