Hard Mode - Only get Snail Pie then Reset

TPE Part - The Following Items you must keep to sell

Get all of the monster Candy

Get the Fadded Ribbon

Get Toy Knife

Get Butts Pie

Exit Ruins

Save and die to Snowdrake 25 times

Put your items in the Box and get and equip Tough Glove (stick)

Get the Snowman Piece

Get the 30G from Snow Poffs

Die to Papyrus

Get the G from the couch in Sans & Papyrus's house

Hangout with Papyrus

Get the Tutu

Get the Quiche

Get the Nice Cream + Punch Card (Overflow the box for Ballet Shoes if you can)

Get Ballet Shoes

Enter the Legendary Artifact Room and use the Annoying Dog

Use the Dog Residue until you get Dog Salad

Get both Astronaut Foods

Mad Dummy

Go to Temmie Village and sell all of the items (not PCard obviously)

Go to Gerson and Buy as many Cloudy Glasses as you can and sell them until you have 1750G

Buy Cool Leg

Buy Temmie Armor

Buy Temmie Flakes

From here you don't need to hold onto items (you still can)

Undyne

Get the Burnt Pan

Buy the Hot Dog...? (Keep)

Buy the Hot Cat and use/drop ASAP

Get the Stained Apron

Go to the last door in the Hotel and exchange the Hot Dog...? for Hush Puppy (Keep)

Skip Mettaton

Equip the Temmie Armor (Bandage)

Get the Worn Dagger

Get the Heart Locket

Asgore and Flowey Fight

Date Undyne (have inventory space for letter)

Get Undyne's Letter

Toss Undyne's Letter

Go to Snowdin and get Undyne's Letter EX

Date Alphys

Buy Potato Chrisps

In the Memory Head fight use the "ITEM" act (Bad Memory)

In Endogemy Fight use the Hush Puppy to instaspare

Exit True Lab

In Asriel fight use the "Dream" act (Last Dream) As soon as you use it Reset

Genocide Part - This Part you mostly steal items and buy items from stores

Get 20 Kills in Ruins

Buy the Spider Dounut/Spider Cider

Kill Toriel

Get 16 Kills in Snowdin

Enter the Snowdin Shop and get the following

Bisicle

Cinnamon Bunny

and Manly Bandanna

Steal from the shop to get more G

Use the Bisicle to get the Unisicle

Kill Papyrus

In the Gerson Shop Buy the Following

Crab Apple

Sea Tea

and Torn Notebook

Get 18 Kills in Waterfall

Kill Undyne

Get the Instant Noodles

Get the following from Catty & Bratty's Shop

Junk Food

Empty Gun

Cowboy Hat

and Mystery Key

(Depending on your inv make room for 6 items)

Enter Burgerpant's Shop and buy the following

Starfait

Glamburger

Legendary Hero

and Steak in the shape of Mettaton's Face

Get 40 Kills in Hotlands

Kill Mettaton NEO

Get the Real Knife

Get The Locket

Time Ends on last item you get

(You can also swap the genocide and TPE parts around if you want, time would end when you use "Dream" on Asriel then)