1st way to die:Digging straight down into lava.
2nd way to die:During a fight with mobs.
3rd way to die:Falling from a high platform.
4th way to die:During a fight with players.
5th way to die:Drowning in a source of water.
6th way to die:Starve to death.
7th way to die:Burning in fire.
8th way to die:Getting blown up by tnt.
9th way to die:During a fight with the wither.
10th way to die:During a fight with the ender dragon.
11th way to die:Dolphin attacks you.
12th way to die:To die from a command block.
13th way to die:/kill your username.
14th way to die:Getting a anvil dropped on you.
15th way to die:Falling out of the world.
16th way to die:By shooting a arrow in the sky and getting hit by it.
17th way to die:Getting killed by a polar bear.
18th way to die:By killing yourself with potions.
19th way to die:By getting killed by a puffer fish.
20th way to die:Suffacating from sand and gravel.