Once Hubie becomes his Platinum version titled The Brave he gains a new ability that you can use at the campfire. This ability is called Portal and Hubie will teleport you to a random location on the map. Hubie is then unavailable for 3 turns the same as his recharge ability before he can be used again.
After using this ability 10 times the achievement unlocks. it looks to me like you don't even have to complete the encounter you land on as the achievement counter increases as soon as you land on the new encounter.
There are a couple options to help complete this quickly.
- You can start an adventure, Portal once then forfeit and start again.
- Equip the Soul Gem to immediately revive Hubie after the first Teleport and Teleport again right away
- Get lucky enough to get the blessing that revives your companion at the end of a map and teleport before leaving the map which reduces time between teleports
Generally speaking this is a very fast achievement and I just used the Soul Gem ring and normal encounter cards and replayed The High Priestess encounter while completing other Tokens and Shards, using the Portal ability whenever I was able.