Coral Island

In order to complete this you must find and donate to the museum 78 unique artifacts.

Artifacts mainly come from Coffers. Coffers are rare drops when destroying trash with your scythe. High concentrations of trash is in the ocean and ocean caves. Once you have a Coffer you take it to the Blacksmith and pay 20coins to process each one. The drops from the Coffers are random and can contain an Artifact, kelp or other minor resources.

There are 6 types of coffers as follows and you will need artifacts from every coffer.

Name: Coffer and Mysterious Coffer
Artifact Count: 12 and 57
Location: Any Ocean Section or Ocean Cave
Map: https://ibb.co/FxW8LsV

Name: Ornate Coffer
Artifact Count: 13
Location: Se Pulu
Map: https://ibb.co/VgsGLbK

Name: Shimmering Coffer
Artifact Count: 13
Location: Dua Pulu
Map: https://ibb.co/LgLQRXy

Name: Marble Coffer
Artifact Count: 14
Location: Empat Pulu
Map: https://ibb.co/kcj96SP

Name: Pirate Coffer
Artifact Count: 12
Location: Lima Pulu
Map: https://ibb.co/SKHkVVH

Once you donate the 78th unique Artifact to the museum the achievement will pop, and you will be rewarded with the Shoulder belt top.


Tips
Artifact Drops are determined per coffer at the time of processing. This means you can stock up some coffers and head to the blacksmith and if you do not get any new artifacts or the last one you are looking for you can reload the day and go try again and will get different results.

In order to give you more real time each in game day to clear trash go into settings on the Game tab and change Game Time Speed to 50% which will slow in game time down to half giving you twice the amount of real time to play each in game day.

Completing Quest: One of Us gives you the special item Merfolk Blessing (The Merfolk have bestowed their blessing upon you, embracing you as one of their own!). This gives you the Merfolk form allowing you to sprint and dash under water, very useful.


Upgrade your scythe to copper, bronze, gold, and then Osmium. Allows you to clear trash faster an apply more enchants.

Enchanting your scythe at Giant Village with: No Energy Drain which at tier 4 gives you 40% chance not to consume energy on hit. Rare Drop % and Extra Drop % is advised.

I use No Energy Drain on Copper and add Rare Drop on Silver/Gold then add Extra drop once I upgrade it to Osmium.

Equipping the 'ring of speed' which increases tool speed use is very noticeable.
Equipping the 'blessed opal ring' which increases the chance to find rare items also helps.
- Note: I tested wearing two of these and while it may have slightly increased drop rates the loss of tool speed was painful and not worth the effort.
Both of these rings will come from chests in the caverns as you progress through them.