Easily get the 3 achievements for killing Bast.

Tougher than your average cat
Lead Bast to death 7 times

Cat killer
Lead Bast to death 100 times

You monster!
Lead Bast to death 1000 times

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To get the achievements for 7, 100, and 1000 deaths easily, do the following:

1.) Load Level 3

2.) Keep something down on you run key...or if you play with a controller, lean something against your analog stick.

3.) Bast will continuously run into these spikes allowing him to die and respawn.

4.) Walk away and do something else until you have received the 3 achievements.