A few more:
Positive
1. Number of kills before dying: 2, 3, 5, 10, 15, 20, 30, 50, 100
2. Killing someone more than 7 levels above you
3. Killing a lot of people with the repulsion
4. Killing someone when you have less than 10% of your health left
5. Killing someone while you're a pig
6. Never dying once
Negative
1. Died the most
2. Getting killed by someone more than 7 levels below you
3. Falling off too many cliffs (but not pushed off by the repulsion)
4. Getting killed by your own reflected attack
5. Never killing anyone (not counting yourself)