Mycelarium Achievements: All 19 and How to Get Them
Every Mycelarium achievement with a practical route: growth milestones, mushroom factories, animal scares, secrets and the ending.
Mycelarium added Steam achievements in update 1.02 on 5 November 2026, two days after launch. There are 19, and they split into five groups: growth, mushroom production, animal defence, secrets, and the ending. Most unlock through normal play; four require a deliberate detour.
The global unlock rates are still low because the achievements are new. The most common sits around 5%, and the rarest around 0.1%, which is normal for a two-day-old list.
Growth achievements
These five track total mycelium length and cannot be missed if you keep expanding:
| Achievement | Requirement |
|---|---|
| Great start! | Grow 1,000 cm |
| We're just getting started | Grow 50,000 cm |
| Serious business | Grow 150,000 cm |
| My beautiful soil | Grow 450,000 cm |
| We are the Forest now | Grow 1,000,000 cm |
The last one is the long tail. A focused run can reach it by expanding across the surface and into all three layers; a relaxed run may take several sessions. Rain windows are the cheapest way to add length, so use them for long connections rather than short corrections.
Mushroom production achievements
| Achievement | Requirement | Practical route |
|---|---|---|
| Small Factory | Build 20 Predator Mushrooms | Build them inside the defended zone |
| Industrial revolution | Build 100 Predator Mushrooms | Needs a mature food economy |
| Thirsty Shroom | Produce 1,000 water with Water Mushrooms | One upgraded Water Mushroom over time |
| Like French Fries | Consume 15 full trees with the Consumptor | One tree at a time, defended |
| The soil is mine | Build a fully upgraded Digger Mushroom | Buy every Digger branch node |
The 100-Predator milestone is the heaviest. Build them in batches as food allows, and do not let them sit at the frontier where animals can remove them. A cluster inside a Stinky radius counts the same as a scattered set.
Animal achievements
| Achievement | Requirement |
|---|---|
| Fight back | Use a Repeller on an animal once |
| Hold your ground | Use a Repeller on an animal 20 times |
| Red Alert | Scare off crows and squirrels 10 times |
| Hedgehog Bus | Shoot spores from a hedgehog's back |
The first two are automatic if you defend a base. Red Alert needs ten separate scares, so keep a Repeller on a route the thieves use. Hedgehog Bus is the odd one: it requires a spore launch near a hedgehog, and the exact trigger is still being tested by the community.
Secret achievements
| Achievement | Requirement |
|---|---|
| Magic Shrooms | Find all five magic mushrooms |
| Family Reunion | Find the Alien Ship |
| Days of the past | Find the T-Rex skeleton |
The magic shrooms are spread across the three layers: Water and Cosmos on Brown Dirt, Flora and Fauna on Grey Dirt, Light on Red Dirt. The T-Rex skeleton is on the deep layer; the alien ship is another deep secret. Neither has a fixed coordinate, so search the stone chambers methodically.
The magic shrooms guide→ has the layer table, and the 100 percent checklist→ combines the secrets with the rest.
The ending achievement
| Achievement | Requirement |
|---|---|
| The Great Migration | Finish the game by a great migration |
This is the only achievement tied to the ending. It requires Exploration Mode, because Survival removes the final goal. The trigger is narrative rather than a simple counter, and the exact sequence is covered in the ending guide→.
Which achievements should you chase first?
The efficient order is:
- Growth and production while the colony is small; they arrive on their own.
- Animal scares once you build a Repeller for defence.
- Magic shrooms while clearing layers one and two.
- Digger when you need penetration anyway.
- Trees when the surface economy is stable.
- Secrets and ending in the late run.
Do not chase 100 Predators before the food loop is stable. The build cost will starve the network, and the achievement will still be there later.
The counters track your current save. If you did the action before 1.02, the achievement may not have existed to record it; redo the action if the unlock does not appear.
Do achievements unlock in Survival Mode?
The list does not mark any achievement as mode-exclusive, and the actions (growth, building, scaring, collecting) exist in both modes. The exception is The Great Migration, which needs the ending and therefore Exploration Mode.
FAQ
How many achievements are there?
Nineteen, added in update 1.02.
What is the hardest achievement?
We are the Forest now for 1,000,000 cm is the longest grind. Hedgehog Bus is the most finicky because the trigger is unclear.
Do achievements carry across saves?
Steam achievements are account-level and persist. The in-game counters are per save.
Is there an achievement for all magic shrooms?
Yes, Magic Shrooms, and the HUD quest FIVE MAGIC MUSHROOMS tracks the same goal.
Official source: Mycelarium achievements ↗ Official source: Update 1.02 notes ↗
The Steam store page ↗ lists the game's features and release date; the discussions hub ↗ has player reports on the secret locations.