There are custom advancements to aid with progression and the many custom mechanics.

~Obscure processes;
Crouch jumping on bedrock will randomly drop Flint
Hanging Roots can be mined by hand
Breaking Sand or Dirt with flint will drop various related items
Breaking Sea Grass with flint has the chance of dropping Kelp
Breaking Tall Grass with flint has the chance of dropping Sugarcane
Breaking Sugarcane with flint has the chance of dripping Bamboo
Bees can pollinate Oak Saplings into Birch saplings, and Bamboo Saplings into Cactus when on sand.
Throwing Eggs onto Mud can spawn a baby Pig, and a baby Rabbit when thrown into a dandelion.
Feeding baby Pigs Carrots has the chance of converting it into a Sheep, and feeding Potatoes to baby Pigs can convert them into Cows.
All fish caught will be alive.
It will Snow at high altitudes in the overworld.
Grass broken in the dark will spawn various bugs.
Oak Leaves broken in the dark can drip Dark Oak Saplings
Sniffers can sniff out Chorus Flowers
Azalea Leaves can drop Glow Berries
Flowering Azalea Leaves can drop Cherry Saplings
The big leafy parts of Bamboo can drop Jungle Leaves
Cherry Leaves can drop various Flowers
Jungle Leaves can drop Cocoa Beans


~Crushing;
Dropping a Falling Block 3 or more blocks can crush the block beneath it.
Sometimes items will be knocked loose.

(Example; Crushing Cobblestone will convert it into Gravel)






~Composters;
Now crafted with 4 sticks, Composters will now prevent one stack of items from despawning while inside.
But be careful! Foods will spoil, converting into rotten flesh or mushrooms depending on what item is being fermented.



~Smelting;
Items on blocks that are being heated can be smelted (Not all smelting recipes are able to be done this way)
This process can result in the block that the item was cooked on being converted into another type.
Some recipes need a special flame or temperature, like Soul Fire or Lava.
When smelting with lava, Fire-based mobs will occasionally spawn.

(Example; Cooking a an item on a clay block will convert the clay into terracotta)



There are a few more complicated ways of obtaining materials, here are some basic instructions and recipes;