The cheapest item to break down into materials (that are useful to a point) are regular ol' Potions. Takes 1 Alkahest to break down 1 Potion. Alkahests themselves cost 800g or drop off an enemy consistantly way later in the game. Farming money is a pain in the early game, so if you wanna be patient on this, wait to fight Amys. They also drop off another enemy but with less chance. So go to Johannes, and get breakin' em down. 10 of 'em and it's yours.
Easy "Usurper" Achievement
This one is easily missed if you're going for the correct ending. You basically have to kill Gebel, again if you've already done the Just a Flicker achievement, except this time you kill him with Zangetsu's sword, Zangetsuto. The problem is, that if you slash the moon when it turns red while holding the sword, you can potentially miss this. To avoid that, there's an item in the Hall of Termination called the Gauge Glasses. Wearing these will allow you to see an enemies health. Thus, slap em on and beat Gebel up until he's damn near dead, put on Zangetsuto, and slay him. Quite complicated, but nothing too special.
Easy Money
After encountering Harry he will plant seeds and grow crops to share with you. You can buy seeds from Dominique in the shop nearby. Buy as many RICE SEEDS as you can and have Harry plant one. Now leave through the door to your right. Enter and exit Harry's screen 5 times (you'll see the rice grow a bit each time you enter.) The rice stalk will be yellowish on top when it's done. Talk to him and he'll give you 10 Rice. Dominique sells RICE SEEDS for 100 each, but she'll buy the 10 Rice for 160. Be forewarned, however, that you can only carry 99 Rice at a time. So be sure to sell them before harvesting more or you'll just lose them.
Equip Bloodbringer as both a weapon and familiar
Create a Shortcut with Bloodbringer as the weapon but leave the familiar shard blank. The rest of the set doesn't matter. Next unequip your weapon and set Bloodbringer as a familiar. Then switch to the Shortcut you made. (You can also then save a new Shortcut with both set to make this quicker in the future.) The reason this works is because the game won't change some of your currently equipped gear/shards if there's nothing to change to in that gear/shard slot.
Fight the Librarian
If you borrow the Tome of Conquest at the Librarian O.D. and head to a room located at Glacial Tomb (more specifically two rooms to the left of the area's warp portal), you will be met by the Librarian himself, ready to enact punishment for not returning his valuable book! he is fairly strong, but beating rewards the player with a shard that allows for stopping time. Also, if you return to his library after beating him, he will be wearing a costume mask and will let the player "pillage" his books (I.E. borrow all the books at once).
File Name passwords
Enter in the password as your file name when starting a New Game.
Effect
Password
"A Kinda Funny Mask"
TEAMFAT
"Dominus" Weapon
Akuma
"Hey I'm Grump"
Egoraptor
"I'm Not So Grump"
Grumps
"The-Baz Mask"
BULLFIGHTER
Big Head Mode
BIGHEAD
Big Mustache
AWESOMEVIDEOGAMES
Clockwork Blade
JEPSON
Darkness Descends
ALPHAOMEGASIN
Dumping Helmet
INTHEBATHROOM
Dungeonite Sword
DUNGEONITE
Egg Helm
EGGFARM
Final Hour - Weapon
TheSpeedGamers
Mega64 Helmet
Jarvis Meower
Plague Doctor Face
swimmingbird
Sega Power Strip Weapon "Gamesack"
8MEGAPOWER
Sicilian Slicer
STEPHENPLAYS
Space Helmet
chuggaaconroy
Unlock Hard/Nightmare modes from the begining.
NIGHTMARE
Vine Sword
SPONGYVINE
Infinite Ammo
Complete all of Susie's cooking quests and you will be rewarded with a hat that when worn doesn't deplete any of your ammo which you equip.
Lili
Obtain Bunny Morphosis shard from Lili.
Piano Recital
Equip Caraboose fairy Familiar Shard (if you don't have it just kill lots of Caraboose pink fairies until you get it) and go to the piano area in Garden of Silence. Sit at the chair in front of the piano and wait for a moment. Miriam will start playing the piano and Caraboose Familiar will start singing alongside her. Once the song is finished you will get the Recital achievement.
Shovel Knight
Obtain EX Shovel Armor from Shovel Armor.
Solomon's Ring
In order to unlock this ring, which, when equipped, increases the drop rates of shards, complete all fifteen "In Memory Of" quests located at the beginning of the starting village. The last quest will reward you with this ring.
Various Steam Achievements
Complete the indicated task to unlock the achievement.
