Objectives

Here are the objectives in skyblock:
1.Build a Cobble Stone generator.
2.Build a house.
3.Expand the island.
4.Make a melon farm.
5.Make a pumpkin farm.
6.Make a reed farm.
7.Make a wheat farm.
8.Make a giant red mushroom.
9.Build a bed.
10.Make 40 stone brick's.
11.Make atleast 20 torches.
12.Make an infinite water source.
13.Build a furnace.
14.Make a small lake.
15.Make a platform 24 blocks away from the island, for mobs to spawn.
16.Make 10 cactus green dye.
17.Make 10 mushroom stew.
18.Make 10 Jack 'o' lanterns.
19.Build 10 bookcases.
20.Make 10 bread.
Source:What are all objectives to Skyblock Survival in Minecraft