Build a Nether Portal in under 11 minecraft days
Make a minecart system that transports you from your house to your mine.
Find diamods in less than 10 minecraft days
Some are hard. That's the point.
If there are pistons in the Xbox 360 version:
- Make an elevator at least 50 blocks tall which takes you from the surface of your world to the bottom of your mine
- Make an elevator at least 50 blocks tall which does the opposite of the one above
If there aren't pistons in the Xbox 360 version:
- Make a large castle with surrounding moat and perimeter wall (as everyone no doubt has done by now)
- Mine out a 60 x 60 x 60 room underground and turn it into an arboretum