Minecraft wiki entry for Advancement_guide, associated text: This advancement is achieved by setting foot in all 50 standard biomes or in the Overworld (the Nether and the End are excluded). The biomes you need to visit are: Badlands, Bamboo Jungle, Beach, Birch Forest, Cold Ocean, Dark Forest, Deep Cold Ocean, Deep Frozen Ocean, Deep Lukewarm Ocean, Deep Ocean, Desert, Dripstone Caves, Eroded Badlands, Flower Forest, Forest, Frozen Ocean, Frozen River, Frozen Peaks, Grove, Ice Spikes, Jagged Peaks, Jungle, Lukewarm Ocean, Lush Caves, Meadow, Mushroom Fields, Ocean, Old Growth Birch Forest, Old Growth Pine Taiga, Old Growth Spruce Taiga, Plains, River, Savanna, Savanna Plateau, Snowy Beach, Snowy Taiga, Snowy Plains, Snowy Slopes, Sparse Jungle, Stony Shore, Stony Peaks, Sunflower Plains, Swamp, Taiga, Warm Ocean, Windswept Forest, Windswept Gravelly Hills, Windswept Hills, Windswept Savanna, and Wooded Badlands. Once you have been in every biome, you will be rewarded the advancement.