ModsFinder

Achievements Optimizer

by bigenergy

With Achievements Optimizer installed on a server, item-based achievement and advancement checks run with fewer inventory scans and less memory churn.

FabricForgeNeoForgeServer required, client optionalMIT License1.18.2 – 26.1.2

What it does

The mod shortens checks that scan an inventory during achievement and advancement triggers. Fewer redundant lookups run on each tick and each inventory event. Gameplay rules and trigger logic are left as they are; only the speed and cleanliness of the checks change.

The mod is aimed at servers and modpacks with many players or complex advancement triggers, where repeated inventory checks add up. Achievements Optimizer requires Architectury API and Forge Config API Port. It is published for Fabric, Forge and NeoForge across 13 release versions, 1.18.2 – 26.1.2, and is released under the MIT License, not as open source.

Key features

  1. Early tick skipping

    Heavy slot calculations for empty, occupied and full slots are skipped early, which avoids extra work on each event.

  2. Instant empty stack discard

    With ignoreEmptyStacks enabled, empty stacks are removed at once rather than after a scan of the whole inventory.

  3. Single-pass multi-item matching

    Inventory is checked in one pass using boolean flags with early exit, avoiding new allocations on large inventories.

Compatibility

Latest build for each game version and loader.

26.x1 of 1 version with builds
26.1.22.1.2Not available2.1.2
1.21.x6 of 6 versions with builds
1.21.112.1.2Not available2.1.2
1.21.102.1.1Not available2.1.1
1.21.92.1.0Not available2.1.0
1.21.42.0.0Not available2.0.0
1.21.12.1.0Not available2.1.0
1.211.21-1.1.0Not available1.1.0.1
1.20.x4 of 4 versions with builds
1.20.4Not available1.1.0Not available
1.20.3Not available1.1.0Not available
1.20.21.20.2-1.0.01.0.2Not available
1.20.11.0.11.0.5Not available
1.19.x1 of 1 version with builds
1.19.2Not available1.0.2Not available
1.18.x1 of 1 version with builds
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 2

Forge Config API PortNeoForge's & Forge's config systems provided to other modding ecosystems. Designed for a multiloader architecture.
Required
Architectury APIAn intermediary api aimed to ease developing multiplatform mods.
Required

How it compares

Full comparison

Tab Optimizer is client-side only, is published for Fabric 1.21.11 and is open source under the MIT License. Bob's Hotbar Optimizer is also client-side only, covers Fabric 1.21.4 – 1.21.11 and is under the Apache License 2.0, not open source. Unlike Achievements Optimizer, both work on the client and do not touch server-side advancement checks.

ModLoadersGame versionsEnvironmentUpdated
Achievements OptimizerFabric, Forge and NeoForge1.18.2 – 26.1.2Server required, client optional2026-06-08
Tab OptimizerFabric1.21.11Client-side only2026-07-23
Bob's Hotbar OptimizerFabric1.21.4 – 1.21.11Client-side only2026-02-09

Questions

Does Achievements Optimizer need to be on the client?

No. Only the server needs the mod; a player's client can run without it, so players can join without installing it.

Which dependencies does Achievements Optimizer need?

Architectury API and Forge Config API Port are both required, so both must be installed alongside the mod.

Which game versions does Achievements Optimizer cover?

The mod has files for 13 release versions, 1.18.2 – 26.1.2, with the latest Fabric and NeoForge files at 2.1.2 for 26.1.2.

In the catalog

Achievements Optimizer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 15,189 mods support Minecraft 26.1.2.

Optimization mods3,545Fabric modsMods for 26.1.215,189

More from bigenergy

All projects
FTB Quests Optimizer1.16.5 – 1.21.1Glassential Renewed1.20.1 – 26.3Decorative Blocks Reborn1.21.1 – 26.3JEIOptimizer1.19.2 – 26.2Re-Retro Damage Indicators1.21.1 – 26.2FastPipes1.20.1 – 26.2

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What the author says

Achievements Optimizer 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…
bigenergy, on the Modrinth page

Official listing

Owner
bigenergy
Published
2023-12-21
Updated on Modrinth
2026-06-08
Facts verified
2026-10-15

Tags

OptimizationUtility
Open on ModrinthCompare