Custom Advancement Downloader
A mod to download information (json format) about all achievements you are able to see! Can be used together with a world downloader to get a more accurate world!
About this Mod
How to Use the Mod:
Join any Minecraft server.
Run the command:
/save advancements- This command can be executed at any time after joining.
Check the output in chat.
- The mod will confirm that the advancements have been saved
Output File:
- The advancement data will be saved as a text file named:
<Server-IP>-ADVANCEMENTS.txt - This file is located in your
.minecraft/config/ - The output is in formatted Json.
What It Does:
The mod scans and saves all client-side advancement data.
Only works on advancements which you are able to see.
Useful for mod or datapack developers who want to:
- Analyze custom advancement data.
- Recreate advancements.
Great to use in combination with:
Available Versions
How to Install Custom Advancement Downloader on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.5).
Install Mod
Open the mod browser in the dashboard and search for "Custom Advancement Downloader". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.5, 1.21.4
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Custom Advancement Downloader server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.5). You can switch loaders with one click in the panel.
Is Custom Advancement Downloader compatible with fabric?
Custom Advancement Downloader officially supports fabric for Minecraft 1.21.5, 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Custom Advancement Downloader – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Custom Advancement Downloader consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install Custom Advancement Downloader with just one click on your server.