The new silhouette-based art was first inspired by the beautiful Overland achievement art here. https://twitter.com/heatpenn/status/1187899037346721792
Then I took it in its own direction based on the look of the in-game worn paper menu in Eye of the Temple.
A lot of the shapes in the achievement graphics are directly made from 3d models used in the game. This is how it looks in Unity.
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