Dragon Age: The Veilguard

In order to witness this (and the other 5 memories of Fen’Harel), you first need to progress the story up to the “Shadows in Blight” quest, where you’ll get a Fen’Harel statue from the Inquisitor.

The quest relating to this, in fact, is the “Regrets of the Dread Wolf” side quest, which you can start by playing through Solas’ memories in the Crossroads. As soon as you’ve completed 1 of those, and collected the Fen’Harel statue at the end, it’ll unlock the quest in your quest log - a quest that will require you to seek out the 5 Fen’Harel statues. These 5, plus the story one you receive, make up the location of all 6 Fen’Harel statues.

Once you’ve got a Fen’Harel statue, and got past the “Shadows in the Blight” main quest, head back to the Lighthouse and you’ll be able to put said statue on a plinth.

The fourth statue goes on the plinth on the northeast of the central atrium, on the stairs. Once you’ve watched this memory and shared your experience with the team, this achievement will unlock.