For those familiar with emulation, this is a pretty easy set of achievements to get. With the exception of Castlevania 1 and Castlevania The Adventure, you can use passwords to get to the final stages of every game. You will have to grind those games and I emphasize grind for Castlevania The Adventure. However with save state, you can complete the game without getting hit. There are plenty of playthough videos on Youtube and I got these passwords from various places that I will credit. The point to this guide is to save time in searching each individual game for passwords like I had to. Kid Dracula's password only goes to level 7. You will have to grind levels 7,8, and 9 to beat the game. It's a fun game so it's not that bad. Kinda reminded me of the old Tiny Toons games a bit.

NOTE: I acquired the Kid Dracula password from sinstar here in the Steam guides. Be sure to swing by their guide and give them a thumbs up and award for their contribution.

WARNING! BE SURE TO MAKE A SAVE STATE EITHER BEFORE OR IMMEDIATELY AFTER THE FINAL HIT OF THE FINAL BOSS!

As I said, you will need to play through this game. No shortcuts except for save state.

(Maxed Level, Inventory, Best Ending)

(Maxed Level, Inventory, Best Ending) *UNTESTED*
G9JV 4TBQ P5QV 3T7Q

No Passwords available. This is the hardest of them all in my opinion. I tip my hat to those that beat this on the Gameboy because I never could. Luckily there are only 4 stages but as I said, it's a grind.

Castlevania 2 Simon's Quest Passwords[strategywiki.org]
Castlevania 3 Dracula's Curse Passwords[gamefaqs.gamespot.com]
Super Castlevania 4 Passwords[retromaggedon.com]
Castlevania 2 Belmont's Revenge Passwords[gamefaqs.gamespot.com]
Castlevania Bloodlines\The New Generation Passwords[www.vgmuseum.com]
Kid Dracula Passwords