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.
