Complete the indicated task to unlock the achievement

Achievement	How to unlock
Bosshunter rank III	Beat the third boss.
Bosshunter rank II	Beat the second boss.
Bosshunter rank I	Beat the first boss.
It's only beginning	Complete first level.
Jackpot!!!	Destroy any gold enemy.
Tinkerer	Purchase any weapon upgrade in shop.
True hero	Destroy 100 enemies in one run.
Well...	You died.