In this guide I'll list the items you need to have before moving on in the game for the achievement "Collector". This guide will contain major spoilers, if you don't want them, please click away now!

The general rule is to talk with everybody and explore every room. The game will ask you if you want to leave to a shrine, make sure to check if you got every item before jumping on it. In the shrine you'll automatically leave after each boss fight. You can check your inventory during boss fights, in case you're missing items, just die on the boss fight.

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Talk with Cornell every single day to have the option on the last day to take him with you to the Shrine.

Jun's Mask You will get this automatically at the beginning of the game
Tram Ticket You will get this automatically at the beginning of the game

Talk with Ordor and return his baseball cap.

Elegent Hourglass Finish the puzzle room, you find it after you got left on the first fork.
locket You find it in the first room with a healing well.
Celestial Shrine Key

Fancy Lip Glodd Talk with Lux to get the quest to retreive her lip gloss.
Vesper's Manga Talk with Vesper and follow him around.

Serpent Amulet puzzle room
Forge Shrine Key

There is a door in this shrine you can't open yet. You'll come later back for it

Healing Crystal Talk with Rainy to do his side quest.
Talk with Camelia to get het side quest, you can't finish it today.
Ancient Book Talk with Cerissa to do here sidequest. If you get stuck on the puzzles, use this guide

Dusty Old Relic Puzzle room
Undercroft Shrine Key

Horace's Lighter Talk with Horace to start his sidequest.
Talk with King about the love letters. Follow the side quest after that till they are together.

Go to the shrine with Cornell

Heavy Vintage Ring - make sure to collect this before going to the boss, but if you accidentally go there you can die to still get it - Thank you Marklar for this extra info

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Missi the Achievement Huntress