Here is the full list of all 10 Tenebris Pictura achievements worth 1,000 gamerscore.
Wake up on the ship
Get 1 Tenebris Vitrum
Get 5 Tenebris Vitri
Get 10 Tenebris Vitri
Get 15 Tenebris Vitri
Get 20 Tenebris Vitri
Get 30 Tenebris Vitri
Get 40 Tenebris Vitri
Get 50 Tenebris Vitri
Make your way to the end