I love frozen biomes

This datapack changes temperature noise value to the lowest so Minecraft generates only coldest biomes.

Biomes shown in the list weren't chosen manually, these are the biomes Minecraft generates when temperature is the lowest.

List of biomes that can spawn in this world

Ocean biomes

Mushroom Fields, Deep Frozen Ocean, Frozen Ocean

Coast biomes

Stony Shore, Snowy Beach

River biomes

Frozen River

Mountain biomes

Snowy Slopes, Grove, Jagged Peaks, Frozen Peaks

Hills biomes

Windswept Gravelly Hills, Windswept Hills, Windswept Forest

Regular biomes

Ice Spikes, Snowy Plains, Snowy Taiga, Taiga

Cave biomes

Lush Caves, Dripstone Caves, Sulfur Caves, Deep Dark

The datapack also changes or deletes some advancements so all vanilla advancements are achievable (26.2 only feature).

Changes to advancements

Nether tab

Changed advancements

How Did We Get Here? (Dolphin's Grace effect is not needed)

Adventure tab

Deleted advancements

Heart Transplanter

Is It a Bird?

Sound of Music

Isn't It Scute?

Changed advancements

Monsters Hunted (Camel Husk, Creaking, Parched are not needed)

Smithing with Style (Vex armor trim is not needed, the description lies)

Adventuring Time (all biomes that don't generate are not needed)

Husbandry tab

Deleted advancements

Bukkit Bukkit

When the Squad Hops into Town

With Our Powers Combined!

Smells Interesting

Little Sniffs

Planting the Past

Good as New

Shear Brilliance

Changed advancements

Two by Two (Armadillo, Camel, Donkey, Frog, Mule, Ocelot, Panda, Sniffer, Turtle are not needed)

The Whole Pack (only Ashen, Pale, Snowy wolves are needed)

Fully compatible with all of my worldgen datapacks here excluding I love warm biomes for obvious reasons. Advancements changes aren't compatible though.