Horde Mode Trophy in Moonlighter
Defeat three waves of enemies in a Wave Room
How to unlock Horde Mode
A Wave Room is a secret room with the pillar in the middle. Use the pillar and it will activate 3 portals that enemies will come out. You must do this four times. Each time you do, the chest you receive will be upgrade from bronze, silver, gold, and then red. Once you complete the final wave of enemies during your fourth use, the trophy will unlock.