Dragon Age Origins Walkthrough and Cheats

City Elf
Dalish Elf
Dwarf Commoner
Dwarf Noble
Human Noble
Mage

Opening Locked Chests - Unlocking chests and doors without a key is a thief-only skill, and their rank in the skill has to be high enough for the task. If your character isn't a thief, you can take control of Leliana or Zevran, after they join your party, to have them attempt to pick the locks. Another thing to be aware of is that injuries can cause a thief to temporarily be unable to open chests and doors they otherwise could.

Apparently, the ability for all classes to be able to "bash" open locks was meant to be included in the game, but didn't make it into the final version. If you'd like, you can download a mod that restores this ability here: Lock Bash. There is some realism to it in that you occasionally destroy an item in the bashing, and the broken door or chest are left behind. Installation instructions are in the description at the link.

Curing Injuries - Injury kits cure those persistent injuries that lower your party's stats; the stronger the kit, the more injuries it can cure at once on the same character. Injury kits can be purchased in limited amounts at merchants, or can be crafted by an herbalist if they have the recipe and sufficient skill. A free way to cure wounds is to take your party back to camp. You don't have to sleep or do anything special, just be at camp, and the injuries will heal.

Gauntlet Bridge Puzzle Solution - The Gauntlet walkthrough on wikia has the full solution for the Test of Faith and the rest of tests.

Where do I find all of the Black Vials? - This is a tricky quest because one of the vials is in a random encounter, and another is often missed due to a cutscene in the Werewolf Lair. Here's a walkthrough for the Revenant and phylactery locations: Black Vials Walkthrough.

What's the deal with landmarks? - Occasionally, you'll see a landmark marked on your map. When you find it and click on it, if you have the war dog in your party, the game will say something about your dog being interested in it. Switch to your dog and click on it again for a benefit.

My game keeps crashing during the Final Battle with the Archdemon! - At least a few of us are running into problems in that final battle despite our computers handling the game fine until then. If that's happening to you, possible solutions include turning your graphics settings down, drawing your camera angle as far back as possible, and/or trying to minimize the spell effects on screen at once. I kept crashing when I had the arch demon's health bar down by 3/4, still with lots of army running around battling. To get through it, I un-ticked "persistent gore" and "sparkle effects around loot" under options, then kept my character on the ballistas rather than under the archdemon's feet.

Dragon Age: Origins Video Walkthrough
Check out this youtube channel's Dragon Age Origins Playlist for a video walkthrough of the game, continuing from Parts 1-10, posted above.

Dragon Age: Origins Walkthrough
This is the best text walkthrough I've seen for Dragon Age. Includes origins and screenshots. With Maps!

Dragon Age: Origins Awakening Walkthrough
Dragon Age: Origins Awakening Walkthrough and SuperGuide.

The standard possible companions:

Alistair - Warrior Templar
Dog - Mabari War Dog
Leliana - Rogue Bard
Morrigan - Mage Shapeshifter
Oghren - Warrior Beserker
Sten - Warrior
Wynne - Mage Healer
Zevran - Rogue Assassin

It is very possible to miss opportunities to have companions join your party, or even antagonize them into leaving. You have to be careful with the conversation options when you meet them, and listen closely to their personalities and approval/disapproval as you adventure with them. Each has gifts they like, and enjoy being listened to, so if your approval ratings with them start to slip, these are ways to bring them back up again.

For more about the companions:
Dragon Age: Origins Companions Locations and Gifts CheatSheet
As spoiler free a list as possible while telling you where and how to get them, and what kinds of gifts they like.

Or:
Wikia Dragon Age: Origins Companions Section
With more information and entries on speculated, temporary, and downloadable content companions.

You get two specializations related to your class to further customize your character. Specializations can be taken at level 7 and 14, if you've unlocked them. They can be unlocked at any level, and are learned from an NPC or by buying a manual from the game's NPC merchants. Once you've unlocked a specialization, your subsequent characters will have access to it.

Companions join the party with one specialization and are able to take a second later.

The specializations are:

Warrior:
Berserker
Champion
Reaver
Templar

Rogue:
Assassin
Bard
Duelist
Ranger

Mage:
Arcane Warrior
Blood Mage
Shapeshifter
Spirit Healer

Specialization benefits and skills, and who teaches them or where to buy a manual can be found here: Dragon Age Specializations.

Dragon Age Origins Achievements for Xbox 360

Dragon Age Origins Trophies for PS3

Dragon Age Origins Cheats for PC
Cheats for Dragon Age are entered through console commands. Instructions at the link. Alternatively, Dragon Age has an extensive and talented mod community where you can find items to fulfill just about any cheat need you could want, like:

Utility Sack which can be used to add stat points, gold, items, change the tier level and material of items, add bonuses and remove restrictions on the fly, dispose of items for gold anyplace rather than carting your full pack back to a merchant, and many other fun and useful cheats.

Check the Cheats and God Items category at Nexus to see other cheat mods that might suit your needs.

Dragon Age Origins Wiki on Wikia
With articles on the companions, characters, the origins, locations, specializations, and more.

Bioware's Dragon Age Wiki
With articles on lore, characters, crafting, combat, magic, and more.

BIoware's Dragon Age Origins Forums