Bronze

Blue Lagoon Clean Sweep
Complete all Sector Challenges in Blue Lagoon.

Needle Hills Clean Sweep
Complete all Sector Challenges in Needle Hills.

FEBA Clean Sweep
Complete all Sector Challenges in the FEBA.

Grave's Bog Clean Sweep
Complete all Sector Challenges in Grave's Bog.

Hanging Gardens Clean Sweep
Complete all Sector Challenges in the Hanging Gardens.

Plains of Goliath Clean Sweep
Complete all Sector Challenges in Plains of Goliath.

Iknimaya Clean Sweep
Complete all Sector Challenges in Iknimaya.

Swotulu Clean Sweep
Complete all Sector Challenges in the Swotulu.

Va'erä Ramunong Clean Sweep
Complete all Sector Challenges in Va'erä Ramunong.

Kxanìa Taw Clean Sweep
Complete all Sector Challenges in Kxanìa Taw.

Torukä Na'rìng Clean Sweep
Complete all Sector Challenges in Torukä Na'rìng.

Silver

Turn the Tide
Claim 50% of all territories.

Digital Bookworm
Unlock 20 Pandorapedia articles.

Weapon of Choice
Kill 100 enemies using the dual wasps or the bow.

Jack of All Skills
Use every Rank 4 skill 20 times.

A God is Upon Us
Get 10 kills in a row without dying.

Bring On All Comers!
Complete 150 Multiplayer games.

The Enemy's Bane
Finish a Team Deathmatch with the most kills of either team.

Flawless Victory
Win 3-0 in 'Capture the Flag'.

Destructive Preservation
As an RDA grunt, reach the end of the timer with 3 intact missiles.

Pandora's Protector
As a Na'vi warrior, reach the end of the timer with 3 intact crystals.

The Conqueror
Win 5 'Capture and Hold' matches.

Central Focus
Win 5 'King of the Hill' matches.

Gold

Clean Sweep of Pandora
Complete every Sector Challenge in the game.

Platinum

Pandora Master
Unlock all trophies.

Secret x15

? ? ?
Unknown (But probably the same as these - just need confirmation of trophy values)

Source