Achievements Optimizer Mod (1.21.10, 1.20.1) is a lightweight performance mod that optimizes how item-based achievements and advancements are processed — reducing unnecessary inventory scans and improving overall tick efficiency. It doesn’t change any gameplay mechanics or logic — only makes achievement checks faster and cleaner under the hood.

Features:

Key Optimizations

  • Early tick skipping — heavy slot calculations (empty/occupied/full) are skipped early, preventing extra work per event.
  • Instant empty stack discard — with ignoreEmptyStacks enabled, empty stacks are removed immediately without scanning the entire inventory.
  • Fast multi-item matching — single-pass inventory check using boolean[] flags with early exit. No allocations, noticeably faster on large inventories or long condition lists.
  • Early slot filtering — slots.matches(full, empty, occupied) is evaluated first, avoiding deeper checks when slots don’t match.
  • Preserved fast path for single targets — when items.size() == 1, the comparison is done directly on the changed slot without a full inventory pass.

Result

  • Fewer redundant checks, less memory churn, and faster responses to inventory events.
  • Particularly beneficial for servers or modpacks with many players and complex advancement triggers.

Screenshots:

Requires:

Minecraft Forge or Fabric API or NeoForge Installer

How to install:

Click the following link to view details: How to Install Mods for Minecraft Java Edition on PC: A Beginner Guide

Achievements Optimizer Mod (1.21.10, 1.20.1) Download Links

For Minecraft 1.16.5

Forge Version: Download from Server 1

For Minecraft 1.18.2

Forge Version: Download from Server 1

For Minecraft 1.19.2

Forge Version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.1, 1.20

Forge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.2

Forge Version: Download from Server 1 – Download from Server 2

For Minecraft 1.20.4

Forge Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.1, 1.21

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.3

NeoForge Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.4

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.10, 1.21.9

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

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