Here is the full list of all 50 DmC: Devil May Cry: Definitive Edition achievements worth 1,000 gamerscore.
You've completed Vergil's downfall
You defeated an Imprisoner
You completed Dante's story
You have defeated Mundus
You helped Vergil open the Vault
You have acquired Kablooey
You have defeated Mundus' spawn
You have acquired Revenant
You have acquired Aquila
You have acquired Dante's the Devil Trigger ability
You helped Phineas by retrieving his eye
You have acquired Eryx
You have defeated the Tyrant in the church
You have acquired the Angel Boost ability
You have slayed 100 Demons as Dante
You have acquired Osiris
You have acquired Arbiter
You have defeated the Hunter
You have purchased Dante's first upgrade
During "Found" you killed 10 enemies using the Hurricane ride
You defeated a Wisp
Complete all missions on the Son of Sparda difficulty with Dante
Complete all missions on the Dante Must Die difficulty with Dante
Finish "Secret Ingredient" while killing all of the enemies during the descent
Slay 1,000 Demons as Dante
Slay 2,500 Demons as Dante
Spend 20,000 Red Orbs as Dante
Upgrade Dante's health to maximum
Purchase all of Dante's combat upgrades
Upgrade Dante's Devil Trigger to maximum
Free all of the Lost Souls in Dante's story
Complete 10 Secret Missions
Complete all of the Secret Missions
Complete all missions (on Nephilim or above) on Hardcore mode with Dante
Complete all missions (Nephilim or above) on Hardcore mode with Vergil
Complete Vergil's downfall on Son of Sparda difficulty
Complete Vergil's downfall on Vergil Must Die difficulty
Be awarded a SSS rank on 10 different missions with Dante
During "The Plan", kill all of the enemies before entering the tower
Be awarded a SSS rank on 5 different missions with Vergil
Kill 1000 enemies with Vergil
Upgrade Vergil's health to maximum
Upgrade Vergil's Devil Trigger to maximum
Purchase all of Vergil's combat upgrades
Free all of the Lost Souls in Vergil's story
Gain a SSS Style Rank during combat
Complete a mission with a SSS rank
Complete a level without taking any damage
Reach wave 50 on Bloody Palace with Dante
Reach wave 30 on Bloody Palace with Vergil