Here is the full list of all 45 Saints Row: Gat Out of Hell achievements worth 1,000 gamerscore.
Played Saints Row: Gat out of Hell Co-op for 3 hours
Flew continuously for 60 seconds
Flew from the roof of Snowball's Chance to Sinterpol HQ's roof, without landing
Shot down a Spire missile with a blast while hovering
Died in the lava
Had five Imps attached to you at one time
Found 100 Soul Clusters
Stayed airborne during Supernatural Jumps or Flight for a combined 10 minutes of gameplay
Collected at least five Soul Clusters without touching the ground
Car surfed on a Comet while it explodes
Bought your first Upgrade from the Upgrade Store
Got a Comet into the Ultor lobby
Got your first Supernatural Powers
Conquer all of New Hades with 100% City Take Over
Choose a new element for all of your Supernatural Powers
Find 75 Barnstorming Diversion locations
Purchase 113 Supernatural Power Upgrades
Fly for 250,000 meters
Kill 150 Demons with the Stomp Supernatural Power
Stonify and Shatter Kill 100 Demons with the Stone Blast Supernatural Power
Kill 25 Arch Dukes
Complete all open world gameplay in two districts of the city of New Hades
Kill 50 of your own summoned Imps
In Torment Fraud, hit 5 vehicles in a row without touching the ground
Get 100 kills with the God's Hammer
Knock a vehicle into the lava
Kill 100 Demons using the Coldfire Aura Supernatural Power
Kill 1000 Demons with any combination of Supernatural powers
Have minions kill 100 Demons with the Summon Supernatural Power
Kill an Arch Duke with a melee attack
Smack into the ceiling 10 times while wall running
Stand on the tallest mast of the 'Queen Anne's Revenge'
Beat the game
Play for at least 2 hours as Gat and 2 hours as Kinzie
Fly for 500 meters while on fire
Get 250 kills with the Essence of Wrath
Get 250 kills with the Essence of Sloth
Stay in contact with the lava for 10 seconds without dying
Find 100% of all Soul Clusters
Take down an Extraction Facility while on a motorcycle
Find 64 Tomes
Upgrade one weapon to the max
Complete ALL of the Challenges
Kill 25 Demons with each of the Seven Deadly Weapons
Spend over 20 hours in Hell