Here is the full list of all 14 Swift achievements.
Earn your first kill.
Kill 500 enemies.
Kill 20 enemies using Melee Weapon.
Kill 100 enemies using Melee Weapon.
Kill 20 enemies using Kunai.
Kill 100 enemies using Kunai.
Kill 20 enemies using Bomb.
Kill 100 enemies using Bomb.
Kill 20 enemies using Fist.
Kill 100 enemies using Fist.
Eliminate two enemies at once.
Catch and kill 20 stunned enemies.
Kill invisible enemy.
Take revenge on your killer. Make him dead within 3 seconds after your death.