How to unlock everything in Gears of War Ultimate Edition

Below is a list on how to unlock everything in Gears of War Ultimate Edition:

WEAPON SKINS
Crimson Omen: Record at least one achievement in Gears 1, 2 and 3 on the SAME Gamertag. Only the Gamertag that has done this will be granted the skin. If you have just recently completed this, please allow 7 days for the skin to show up in your inventory.
Dark Omen: Complete the entire campaign on the original Gears of War 1. Only the Gamertag that has done this will be granted the skin. If you have just recently completed this, please allow 7 days for the skin to show up in your inventory.
Mars, Woodland Camo, Venus, Jupiter, Sun, Grease Gun, Racer: Ultimate Edition BETA skins. If you played in the beta at least one day you will receive these skins on ONLY the Gamertag that played in the BETA.
Gold: Play Ultimate Edition at least one day during launch week (ending September 4, 2015). Skins will be granted up to ONE WEEK after September 4th. Skins will not be available before September 4th.
UNLOCKABLE CHARACTERS

• Samantha Byrne - Level 5
• Kantus - Level 7
• Chairman Prescott - Level 10
• Miner - Level 12
• Dizzy Wallin - Level 15
• Beast Rider - Level 17
• Clayton Carmine - Level 20
• Spotter - Level 23
• Jace Stratton - Level 25
• Flame Grenadier - Level 27
• Commando Dom - Level 30
• Savage Grenadier - Level 35
• Golden Gear - Level 40
• Hunter Elite - Level 45
• Mechanic Baird - Level 50
• Dizzy Wallin Farmer - Level 55
• Benjamin Carmine - Level 60

BETA CHARACTERS
Thrashball Drone: Ultimate Edition BETA character. If you played in the beta at least one day you will receive this character on ONLY the Gamertag that played in the BETA.
Cole Train (Thrashball Cole): Ultimate Edition BETA Saturday Bonus character. If you played on the Saturday in the beta during the planned play period, you will receive this character on ONLY the Gamertag that played during that day in the BETA.