Badges are unlocked by completing various tasks - earning a set amount of badges will unlock various game features for player use.
Below are the badge requirements in order of appearance:
1- CAPTURE: All 'capture' instant action missions are completed at the rank of ensign or higher.
2- DEFUSE: All 'defuse' instant action missions are completed at the rank of ensign or higher.
3- DEMOLISH: All 'demolish' instant action missions are completed at the rank of ensign or higher.
4- ESCORT: All 'escort' instant action missions are completed at the rank of ensign or higher.
5- EXTRACT: All 'extract' instant action missions are completed at the rank of ensign or higher.
6- RECOVER: All 'recover' instant action missions are completed at the rank of ensign or higher.
7- SECURE: All 'secure' instant action missions are completed at the rank of ensign or higher.
8- OVER-ACHIEVER: All instant action missions are completed at ADMIRAL difficulty.
9- COVERT OPS: The campaign has been cleared with a cumulative stealth rating of 300,000 points or higher.
10- TRIDENT: The campaign has been cleared with an overall score of 1,200,001 points or higher.
11- EFFICIENCY: The campaign has been cleared in a total of seven hours or less.
12- PDQ: The campaign has been cleared in a total of four hours or less.
13- EXEMPLARY RECORD: The campaign has been cleared with a cumulative performance score of 400,000 points or higher.
14- TADPOLE: The campaign has been completed at the rank of ENSIGN or higher.
15- FROGMAN: The campaign has been completed at the rank of COMMANDER or higher.
16- SEAL: The campaign has been completed at the rank of ADMIRAL.
17- SUB-ROSA: A mission has been completed with a stealth score of 30,000 or higher.
18- DODGER: A mission has been completed with no team members downed or wounded at all, and no medkit charges have been used.
19- MERCY: A mission has been completed without a single team member killing an enemy.
20- MARKSMANSHIP: A mission has been completed with an accuracy rating higher than 85%.
21- GRENADIER: Over 40 enemies have been killed by the SEALS during your profile career.
22- UNSEEN STRIKE: Over 20 enemies have been killed by throat slitting during your career.
23- BASTILLE: Over 40 enemies have been restrained (captured) by the SEALS during your career.
24- LIQUIDATOR: Over 600 enemies have been killed by the SEALS during your career.
25- SHADOW OPERATOR: Over 150 enemies have been killed stealthily by the SEALS during your career.
26- FIRST AID: Over 40 medkits have been used on the SEALS (including Specter) during your career.
27- ANTI-ARMOR: Over 10 vehicles have been destroyed by the SEALS during your career.
28- MELON HUNTER: Over 150 enemies have been killed by the SEALS by head shots in your career.
29- SUPPORT: All secondary objectives have been completed in any full rank of a campaign.
30- ABOVE AND BEYOND: All bonus objectives have been completed in any full rank of a campaign.
31- COMMUNICATOR: All crosstalk objectives have been completed in any full rank of a campaign.
32- SAUSAGE: All sausages have been found in any full rank of a campaign mode.
Further tips: To get the badgest fastest, do the following...
- Complete all instant action missions at admiral rank from the start, as it will reward two badges for lesser difficulties as well.
- Rush through the game (run n' gun) all the way through ADMIRAL rank. This will unlock the two time-based badges, and the three ranks cleared badges.
- Make sure you destroy all vehicles in a single campaign run - there are over 10 vehicles in the campaign, and if you destroy them all you will earn the anti-armor badge.
- Finally, run through the campaign again on ensign setting, making sure to clear all primary, secondary, bonus, and crosstalk objectives, while also obtaining the sausages. Having already obtained the speed bades, you can play the campaign with all the time in the world, on the easiest difficulty setting now. You can also concentrate on stealth kills, headshots, mercy badge, etc, or if you prefer, use instant action (not mission redeploy!) to obtain the Melon Hunter, Sub-Rosa, Dodger, Mercy, Marksmanship, Grenadier, Unseen Strike, Bastille, Liquidation, Shadow Operator, and first aid badges.
Last, very important note:
MISSION REDEPLOY- Clearing lost objectives under mission redeploy, and any kills or captures, etc, DO NOT COUNT when playing under mission redeploy. You must complete these objectives while in instant action only, or while on a full campaign run through.
Obtaining x amount of badges will unlock the following:
18 Badges- REBEL WEAPONS:
M16A2 assault rifle
M60E3 support machine gun
M40A1 US Marine Corps. sniper rifle
12 Guage Pump action shotgun
24 Badges- SEAL WEAPONS:
9mm Pistol
L96AW sniper rifle
HK7 sub machine gun
IW-80 A2 high powered assault rifle
HK36 assault rifle
32 Badges- MM1 12-shot 40mm grenade launcher
In between these badges are other unlockables, obtained for reaching other badge requirements (game does not state this after you clear it, so I can't relay it to you in detail), and for clearing admiral difficulty, such as adjustable scopes, other weapons, and attachment like grenade launchers.