Here is the full list of all 58 Marvel's Guardians of the Galaxy achievements worth 1,000 gamerscore.
Complete Chapter 3.
Interrupt a Slakebeast with Drax's Call to Action.
Acquire the Ice Element for Star-Lord's guns.
Complete Chapter 2.
Complete Chapter 1.
Capture the Quarantine Zone monster.
Win the bet against Rocket.
Purchase your first Star-Lord Ability.
Complete Chapter 4.
Complete Chapter 5.
Complete Chapter 6.
Complete Chapter 7.
Complete Chapter 8.
Complete Chapter 9.
Complete Chapter 10.
Complete Chapter 11.
Complete Chapter 12.
Complete Chapter 13.
Complete Chapter 14.
Complete Chapter 15.
Complete Chapter 16.
Complete Marvel's Guardians of the Galaxy.
Defeat the Dweller-in-Darkness.
Defeat the Blood Brothers.
Defeat the Meredith Quill delusion.
Survive the manifestations of Thanos.
Defeat Fin Fang Foom.
Defeat Grand Unifier Raker.
Defeat The Magus.
Invest in at least one Special Ability for Gamora, Drax, Rocket and Groot.
Invest in all Special Abilities for all Companions.
Acquire the Lightning Element for Star-Lord's guns.
Acquire the Wind Element for Star-Lord's guns.
Acquire the Plasma Element for Star-Lord's guns.
Revive a fallen team member.
Stagger 25 enemies.
Interrupt a Nova Centurion with Gamora's Call to Action.
Interrupt a Charger with Groot's Call to Action.
Dismember an Inquisitor with Drax's Call to Action.
Attain the maximum possible Momentum 10 times.
Execute a Flair Attack 10 times.
Defeat 15 Staggered enemies with a Charged Shot.
Defeat 15 enemies with Star-Lord's Fan the Hammer ability.
Defeat 10 enemies affected by Drax's Wrath of Katath ability.
Defeat 10 enemies with Gamora's Executioner ability.
Defeat 20 enemies with Rocket's Five Barrel Barrage.
Revive or Heal Companions 10 times with Groot's Gift of the Florae.
Defeat 20 enemies with Star-Lord's Eye of the Hurricane.
Execute an Auto-Combo with Gamora.
Execute an Auto-Combo with Drax.
Execute an Auto-Combo with Rocket.
Execute an Auto-Combo with Groot.
Find half of the Guardian Collectibles.
Find all of the Guardian Collectibles for one Guardian.
Find and equip one Outfit.
Find and equip all Outfits.
Collect 65 % of all Galactic Compendium entries of each category.
Pay your Nova Corps fine.