ACHIEVEMENT - HOW TO UNLOCK Just Getting Started (10 points) - Performed a 20 hit combo. On a Roll (30 points) - Performed a 50 hit combo. Emerald Knight (100 points) - Cleared all missions on Emerald Knight difficulty. Synergy (20 points) - Cleared a mission in Co-op. Emerald Warrior (50 points) - Completed the game on poozer or enforcer difficulty. Demolitionist (15 points) - Defeated 10 enemies with Hover Mines. Favorite Pastime (15 points) - Defeated 10 enemies with Baseball Bat. Blunt Justice (15 points) - Defeated 10 enemies with War Hammer. Shut Your Mouth (60 points) - Performed a 99 hit combo. Master Blaster (15 points) - Defeated 10 enemies with Ring Blaster. Distress Call (10 points) - Cleared mission 4. Possession (10 points) - Cleared mission 5. Central Battery (10 points) - Cleared mission 3. Invasion (10 points) - Cleared mission 1. Diversion (10 points) - Cleared mission 2. Ultimate Weapon (10 points) - Cleared mission 9. Return to Oa (10 points) - Cleared mission 10. Hot Pursuit (10 points) - Cleared mission 8. Corruption (10 points) - Cleared mission 6. Biot (10 points) - Cleared mission 7. There is Hope (40 points) - Collected all 5 Blue Meteorites. Mogo is Proud (40 points) - Collected all 9 Green Meteorites. Not a Poozer (80 points) - Gained experience level 10. Get Dizzy Y'all! (20 points) - Made Green Lantern dizzy 10 times. Rank Up (30 points) - Gained experience level 5. Willpower (25 points) - Purchased all Construct upgrades. Big Spender (100 points) - Purchased all upgrades. Complete Control (25 points) - Purchased all Ring Power upgrades. Might Makes Right (25 points) - Purchased all Attack upgrades. Full Burn (25 points) - Purchased all Ring Surge upgrades. Fan Favorite (15 points) - Defeated 10 enemies with Rocket Punch. Targets Acquired (15 points) - Defeated 20 enemies with Missile Pack. Lights Out (15 points) - Defeated 10 enemies with Piston Blitz. All in the Wrist (15 points) - Defeated 10 enemies with Blade Whip. Locked and Loaded (15 points) - Defeated 10 enemies with Gatling Gun. Beware My Power! (20 points) - Used Ring Surge 10 times. What Goes Up... (20 points) - Launched 20 enemies. Hal Knows Jets (15 points) - Defeated 20 enemies with Jet Fighter. Big Beat Down (15 points) - Defeated 20 enemies with Mech Suit. Around the World (15 points) - Defeated 20 enemies with Mace Storm.
To unlock the Synergy achievement without anyone to play with, or if you want to do it alone, just play Mission 2. It is a flying mission so you don't have to move the other player.