So... I wanted to get the Jungle Fungus achievement (defeating the Mushroom Boss from ??? with only jungle gear) and I killed him a few times but didn't get the achievement. I tried using both variants of the Whip and Ocelot Armor along with Corrupted Seeds artifact but none of them worked. I also tried unequipping cosmetic items but it didn't help either. What am I supposed to do? Like I said, my gear was:

• Whip/Vine Whip
• Ocelot Armor/Shadow Walker
• Corrupted Seeds