ModsJava
Border expands per Achievement
Every achievement expands the world border! A lightweight, lag-free datapack. Free Minecraft Java mod for 1.21.9, 1.21.10, 1.21.11.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Border Expands per Achievement
Every achievement expands the world border! A lightweight, lag-free datapack with a hybrid Nether-scaling system optimized for multiplayer co-op.
How It Works
- Starting Size: The world starts as a 50x50 block area (Radius: 25) centered at
0, 0. - Expansion: Every advancement earned by any player instantly expands the border.
- The Math: Each milestone increases the border diameter by 50 blocks (adding 25 blocks to the radius).
- 0 Achievements: 50x50 (Radius 25)
- 1 Achievement: 100x100 (Radius 50)
- 2 Achievements: 150x150 (Radius 75)
Verified by MCModsHub
- Ships as border-expands-per-achievement-1.21.9-26.2.jar — drop this file into the mods folder
- Download size: 263 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.