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At the end of King Goblin route it is possible to view whole gallery of achievements but 1 picture (Gwynn Demonologist ending).

At some point you can send Nyx to dungeons absolutely naked. Do it 5 times and get The Naked Explorer achievement.

You can give Training Kit to Nyx and get new scene in Goblin Burrows, even if you still don't have access to there.

You can give it to Gwynn on last ending route (Goblin King), so you get achievement in gallery in the end.

You can see the scene on Gwynn Demonologist route ending w/o using token at all, nevertheless.