Island Progression Chart

Rank	Mammet Tools & Unlocked Plots	Cozy Cabin	Cropland & Pasture	Facilities	Landmark	Feature	Visions & Quests	Tool	Materials
1		Cozy Cabin I				Orchestrion	The Coziest of Cabins	Stone Hatchet	Pumpkin Seeds; Cabbage Seeds; Palm Leaf; Apple; Branch; Stone; Clam; Laver; Coral; Islewort; Sand; Log; Palm Log; Vine; Sap
2			Cropland I Pasture I			Makeshift Net Small Animals	Top Crops Adorable Animals
3	(none) → Pathfinder Mk. I ⠀⠀⠀⠀⠀⠀⠀Facility Plot I, II			Workshop I		Minion Release	A Workshop of Wonders	Stone Hammer	Copper Ore; Limestone; Rock Salt
4	Basic → Pathfinder Mk. II  ⠀⠀⠀⠀⠀⠀Landmark I	Cozy Cabin II	Cropland II Pasture II		Towering Tree Fort Quixotic Windmill
5	Better → Pathfinder Mk. III   ⠀⠀⠀⠀⠀⠀Facility Plot III, IV   ⠀⠀⠀⠀⠀⠀Landmark Plot II			Granary I	Boiling Bathhouse			Shovel	Clay; Tinsand; Popoto Set; Parsnip Seeds Granary: Alyssum; Garnet; Spruce Log;  ⠀⠀⠀⠀⠀⠀Hammerhead; Silver Ore
6				Workshop II Granary II		Makeshift Restraint Medium Animals		Copper Scythe	Sugarcane; Hemp; Cotton Boll
7	Best → Pathfinder Mk. IV  ⠀⠀⠀⠀⠀Facility Plot V  ⠀⠀⠀⠀⠀Landmark Plot III Cropworker's Pastureworker's	Cozy Cabin III	Cropland III Pasture III Automation					Bronze Gig	Islefish; Jellyfish; Squid Cropland: Isleberry Seeds; Onion Set; Tomato Seeds; ⠀⠀⠀⠀⠀⠀⠀Wheat Seeds; Corn Seeds; Radish Seeds
8				Workshop III Granary III		Makeshift Soporific Large Animals		Bronze Beakaxe	Quartz; Iron Ore; Leucogranite
9	Bestest → Pathfinder Mk. V  ⠀⠀⠀⠀⠀⠀⠀Landmark Plot IV				Lominsan Lighthouse Water Otter Fountain		The Perfect Paradise Passionate Pioneering The Land, Wind, and Sea	Iron Hatchet*	Resin; Coconut; Beehive Chip; Wood Opal
10						Flight			Multicolored Isleblooms
11									Cropland: Leek Set; Paprika Seeds
12	Spelunking → Determined Digger   ⠀⠀⠀⠀⠀Area: Mountain Hollow				Gamboling Garden		Delightful Discovery A Far Eastern Yarn		Glimshroom; Coal; Effervescent Water Granary: Cave Shrimp*
13		Cozy Cabin IV		Granary IV				Steel Hammer	Shale; Spectrine; Mythril Ore; Marble
14				Workshop IV					Cropland: Runner Bean Seeds; Beet Seeds; ⠀⠀⠀⠀⠀⠀⠀Eggplant Seeds; Zucchini Seeds
15	Bestestest → Pathfinder Mk. VI   ⠀⠀⠀⠀⠀⠀⠀⠀⠀Facility Plot VI   ⠀⠀⠀⠀⠀⠀⠀⠀⠀Landmark Plot V Spl. Spelunking → Det. Digger ⠀⠀⠀⠀⠀⠀⠀⠀⠀Area: Mother Lode				Quaint Clock Tower Uncharted Course		The Land of Luxury A Subterranean Expansion An Ideal Marriage		Yellow Copper Ore; Hawk's Eye Sand
16
17		Cozy Cabin V						Mythril Pickaxe Chisel	Gold Ore; Durium Sand; Crystal Formation
18				Granary V					Cropland: Watermelon Seeds; Sweet Popoto Set; ⠀⠀⠀⠀⠀⠀⠀Broccoli Seeds; Buffalo Bean Seeds
19				Workshop V	Sanctuary Sanctuary Aetherial Arbor	Felicitous Favors*	An Idyllic Island The Sweetest Thing
20						Flawless Net Flawless Restraints Flawless Soporifics

In most cases completing unlocks from previous ranks is required. For example, completing Cozy Cabin II is required for Cozy Cabin III.
Additionally, sometimes other structures from the same Rank are required for unlocks, e.g. Cozy Cabin III is required for Cropland III, Pasture III, and their respective automation unlocks.

Aspects listed with an asterisk (*) have additional prerequisites in addition to the Rank requirement, usually the completion of a vision or quest.

Aspects shown in italics are features which become unlocked but do not require specific crafting or resource expenditure.