Thoroughly A-Ghast is an achievement that requires the player to summon a ghast familiar in Morytania.
The ghast familiar may be claimed after getting all 6 followers in Temple Trekking and Burgh de Rott Ramble to level 99 (3 from Paterdomus to Burgh de Rott and 3 from Burgh de Rott to Paterdomus).
- This achievement used to be a task prior to the release of the Achievements System on 18 April 2017.
- ^ Listed as In Aid of the Myreque in-game, however Darkness of Hallowvale is required to unlock Burgh de Rott Ramble.
- ^ Not listed as a requirement in-game, however it is required to obtain the ghast familiar.