Starting Characters:
COG: Marcus, Dom, Cole, Baird, Anya
Locust: Drone, Savage Drone, Grenadier Elite, Savage Grenadier, Myrrah
Rank Progression Characters:
COG Gear - Level 2
Miner - Level 3
Sam Byrne - Level 4
Beast Rider - Level 5
Dizzy Wallin - Level 7
Hunter - Level 8
Jace Stratton - Level 10
Theron Guard - Level 12
Clayton Carmine - Level 14
Classic Dom - Level 17
Spotter - Level 20
Classic Cole - Level 23
Flame Grenadier - Level 26
Classic Baird - Level 30
Benjamin Carmine - Level 34
Grenadier - Level 39
Civilian Anya - Level 45
Victor Hoffman - Level 50
Hunter Elite - Level 60
Anthony Carmine - Level 75
Medal/Miscellaneous Unlock Characters:
Classic Marcus - Silver Veteran Medal (Play 200 Matches)
Unarmored Marcus - Complete the Campaign, Any Difficulty.
Superstar Cole - Gold MVP Medal (MVP 100 Matches)
Chairman Prescott - Silver Allfathers Medal (Play 200 Matches in all 6 Game Modes)
Golden Gear - Bronze War Supporter Medal (Play in 5 Gears Events)
Savage Theron Guard - Beat Beast Mode, All Difficulties.
Kantus - Gold Medic Medal (Revive 150 Teammates)
Sniper - Bronze Headshot Medal (Get 100 Headshots)
Golden Hunter - Gold Master-At-Arms Medal (Get 300 Kills with all 5 Starting Weapons)
Golden Miner - Gold Rifleman Medal (Get 300 Kills with all 3 Rifles)
Griffin - Facebook Promotion or Gold Big Spender Medal ($300,000 in Horde cash)
Cole Train - Through the Beta or a currently unknown way in the Retail.
Pre-Order Characters:
Commando Dom - GameStop Pre-order Exclusive
Mechanic Baird - Bestbuy Pre-order Exclusive
Savage Kantus - Amazon Pre-order Exclusive
Savage Grenadier Elite - Walmart Pre-order Exclusive
Adam Fenix - Exclusive to Limited and Epic Editions (Or if you redeemed your Gears Infected Omen Controller code before 9/9/11)
DLC Characters:
Bernie Mataki - Confirmed for 1st DLC in November
Onyx Guard - Confirmed for 1st DLC in November
DLC Maps:
Azura - Confirmed for 1st DLC in November
Rust Lung - Confirmed for 1st DLC in November
Weapon Unlocks:
Crimson Omen Lancer - 12 + 2 XBL Gold Card Promotion
Crimson Omen Hammerburst - Welcome to Beast (Survive all 12 waves of Beast mode)
Crimson Omen Retro Lancer - Welcome to Horde (Survive the first 10 waves of Horde mode)
Crimson Omen Gnasher - Welcome to Versus (Kill 10 enemies in Team Deathmatch)
Crimson Omen Sawed-Off - Welcome to Arcade (Complete 5 Arcade Campaign chapters in co-op)
Team Insignia Retro - Bronze Veteran Medal (Play 100 Matches)
Team Insignia Lancer - Silver Veteran Medal (Play 200 Matches)
Team Insignia Hammerburst - Gold Veteran Medal (Play 300 Matches)
Team Insignia Shotgun Set - Onyx Veteran Medal (Play 400 Matches)
Flaming Hammerburst - Unlocked if you played the beta between April 18th - April 24th.
Flaming Lancer - Unlocked if you played the beta between April 25th - May 1st.
Flaming Retro Lancer - No information at the moment...
Flaming Sawed-Off - Unlocked if you played the beta between May 2nd - May 8th.
Flaming Gnasher - Unlocked if you played the beta between May 9th - May 15th.
Gold Lancer - Play Gears 3 online between Sept. 20th and Sept. 27th or Download codes from Gears of War 2 (Carries over if you already have them).
Gold Hammerburst - Play Gears 3 online between Sept. 20th and Sept. 27th or Download codes from Gears of War 2 (Carries over if you already have them).
Gold Retro Lancer - Unlocked in beta (complete 90 matches and get 100 kills with the gold Retro Lancer) or can also be unlocked by getting Veteran Gear in Gears 2.
Gold Gnasher - Unlocked by getting Veteran Gear in Gears 2 and playing in the first week of play in Gears of War 3.
Gold Sawed-Off - Unlocked via the Commando achievement in Gears of War 1 (Complete Gears of War 1 on Insane).
(NOTE - Veteran Gear Achievement in Gears 2 unlocks the gold skin for all five starting weapons)
Chrome Lancer - In Gears 1, finish a ranked match with the highest amount of points.
Chrome Hammerburst - Complete 10 waves of Horde, on any difficulty, on any map, in Gears 2.
Chrome Retro Lancer - In Gears 1, complete 10 different co-op chapters as Dominic Santiago on any difficulty.
Chrome Gnasher - Complete the campaigns of Gears of War 1, 2 and 3, on any difficulty.
Chrome Sawed-Off Have at least one achievement from Gears of War PC.
Onyx Lancer Get 6000 kills with the Lancer in Gears 3.
Onyx Hammerburst Get 6000 kills with the Hammerburst in Gears 3.
Onyx Retro Lancer Get 6000 kills with the Retro Lancer in Gears 3.
Onyx Gnasher Get 6000 kills with the Gnasher in Gears 3.
Onyx Sawed-Off Get 6000 kills with the Sawed-Off in Gears 3.
Gold Omen (all 5 starting weapons) - Reach level 100 in Gears of War 3.
Infected Omen (all 5 starting weapons) - Included with the Gears of War 3 Epic Edition, LE Console or LE Controller.
Liquid Metal Black (all 5 starting weapons)- Included with the Gears of War 3 Season Pass.
Liquid Metal Green (all 5 starting weapons) - Obtained (for free) through a yet to be announced promotion.
Liquid Metal White / Ivory (all 5 starting weapons) - Exclusive to Epic employees or those who are close friends with Joe Graf.