FAMAS in Quick Mission mode - Enter "GRAW2QUICKFAMAS" as a campaign name to unlock the FAMAS in Quick Mission mode.

Bonus headgear - Have a saved game file from Rainbow Six: Vegas or Splinter Cell: Double Agent on your hard drive or memory card to unlock extra headgear items unique to each of those games available when you customize an online character.

ICS-PL Helmet: Rainbow Six: Vegas saved game file.
J-E FO Helmet: Splinter Cell: Double Agent saved game file.
PAS GT Helmet: Rainbow Six: Vegas saved game file.
Tactical Shemagh: Splinter Cell: Double Agent saved game file.

All weapons in Quick Mission mode - Successfully complete the game to unlock all weapons in Quick Mission mode.

Theater options - Successfully complete a level to unlock its theater options.

Character info - Unlock 5 Decorations.

Weapons info - Unlock 10 Decorations.

Music videos - Successfully complete the indicated misison to unlock the corresponding music video:

Gimme Danger: Mission 1
Battle Axe: Mission 3
Hero: Mission 7

Decorations - Successfully complete the indicated task to unlock the corresponding Decoration:

Act 1 (elevated risk): Successfully complete Act 1 under elevated risk.
Act 1 (low risk): Successfully complete Act 1 under low risk, normal risk, or elevated risk.
Act 1 (normal risk): Successfully complete Act 1 under normal risk or elevated risk.

Act 2 (elevated risk): Successfully complete Act 2 under elevated risk.
Act 2 (low risk): Successfully complete Act 2 under low risk, normal risk, or elevated risk.
Act 2 (normal risk): Successfully complete Act 2 under normal risk or elevated risk.

Act 3 (elevated risk): Successfully complete Act 3 under elevated risk.
Act 3 (low risk): Successfully complete Act 3 under low risk, normal risk, or elevated risk.
Act 3 (normal risk): Successfully complete Act 3 under normal risk or elevated risk.

Master Tutorial Challenge 1: Kill all enemies without getting hit.
Master Tutorial Challenge 2: Kill enemies with one headshot per enemy.
Master Tutorial Challenge 3: Kill the tank using only one satchel charge.
Master Tutorial Challenge 4: Have your team kill all five enemies.

Mission Accomplished: Successfully complete all secondary objectives.

Single Player Master: Unlock all other single player Decorations.

Tutorial Walkthrough: Successfully complete the tutorial.

Quick Mission Decorations - Successfully complete the indicated task to unlock the corresponding decoration:

All weapons: Successfully complete the game.

Bullz Eye: Have 100% accuracy.

Hawks Eye: Acquire all intels out of combat.

Iron Man: Do not get hit during the mission.

Predator: Have all fights engaged by you.

Team ELITE decoration: Have no teammates hit and have 50% of the enemies dead by your team.

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Station (Co-op 1) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
The Cut (Co-op 2) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
Locks (Co-op 3) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
Caldera (Co-op 4) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
Outpost (Co-op 5) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
Hideout (Co-op 6) Perfect (20 points): Complete Co-op Campaign Mission without failing an objective, no respawns, on default or hard.
Perfect Co-op Campaign (40 points): Complete all Co-op Campaign Missions without failing an objective, no respawns, on default or hard.
Team Veteran (25 points): Win 30 Team matches with at least 5 gamertags in the room.
Solo Veteran (25 points): Win 10 Solo matches with at least 5 gamertags in the room.
Co-op Veteran (25 points): Win 30 Co-op matches with at least 5 gamertags in the room.
Ultimate Defender (40 points): Win a 60 minute Co-op Defend match on any map.
Helo Hunter (20 points): Shoot down 20 helicopters in the Helicopter Hunt game type.
Demo Expert (20 points): Plant 10 demo charges in Team Mission matches with at least 5 gamertags in the room.
Combat Medic (25 points): Heal 10 teammates wounded by enemy fire in a multiplayer match with at least 5 gamertags in the room.
Team MVP (15 points): Lead your team in kills in a Team match with at least 5 gamertags on your team.
Team All-Star (35 points): Lead your team in kills in 10 Team matches with at least 5 gamertags on your team.
Enforcer (20 points): Eliminate 5 different human opponents in 30 seconds with at least 10 gamertags in the room.
Threatening (10 points): Get a total of 50 kills in Team or Solo matches with at least 5 gamertags in the room.
Dangerous (15 points): Get a total of 150 kills in Team or Solo matches with at least 5 gamertags in the room.
Lethal (20 points): Get a total of 300 kills in Team or Solo matches with at least 5 gamertags in the room.
Ruthless (25 points): Get a total of 500 kills in Team or Solo matches with at least 5 gamertags in the room.
Sniper Expert (20 points): Get a total of 100 sniper rifle kills in Team or Solo matches with at least 5 gamertags in the room.
Single Player Master (50 points): Unlock all other "Single player mode" achievements to unlock the "Single player Master" achievement.
Tutorial Walkthrough (5 points): Complete the whole tutorial at least once.
Challenge 1 Complete (10 points): Complete the first tutorial challenge with the highest appreciation.
Challenge 2 Complete (10 points): Complete the second tutorial challenge with the highest appreciation.
Challenge 3 Complete (10 points): Complete the third tutorial challenge with the highest appreciation.
Challenge 4 Complete (10 points): Complete the fourth tutorial challenge with the highest appreciation.
Mission accomplished (30 points): Complete all the secondary objectives in "Campaign mode" or in "Quick Mission mode".
Act 1 Complete - low risk (10 points): Complete campaign Act 1 in "low risk" or higher.
Act 2 Complete - low risk (15 points): Complete campaign Act 2 in "low risk" or higher.
Act 3 Complete - low risk (20 points): Complete campaign Act 3 in "low risk" or higher.
Act 1 Complete - guarded risk (20 points): Complete campaign Act 1 in "guarded risk" or higher.
Act 2 Complete - guarded risk (25 points): Complete campaign Act 2 in "guarded risk" or higher.
Act 3 Complete - guarded risk (30 points): Complete campaign Act 3 in "guarded risk" or higher.
Act 1 Complete - elevated risk (30 points): Complete campaign Act 1 in "elevated risk".
Act 2 Complete - elevated risk (35 points): Complete campaign Act 2 in "elevated risk".
Act 3 Complete - elevated risk (40 points): Complete campaign Act 3 in "elevated risk".
Bull's eye - Quick mission (30 points): Finish a mission with a 100% accuracy statistic.
Iron man - Quick mission (30 points): Finish a mission without being hit.
Team "Elite" - Quick mission: (30 points): Finish a mission with no teammates wounded and +50% enemies killed by them.
Hawk's eye - Quick mission: (30 points): Finish a mission with all your intels acquired while out of combat.
Predator - Quick mission: (30 points): Finish a mission with all fights engaged by you.