World to the West (Xbox One)

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Mystery treasure after unlock 36-slotted battery door

Lumina

Obtain a special pair of tech-like shoes
Go to home of Oleg the hermit, speak to the cat
Drastically reduce cooldown of teleport ability
The hint is shown beside Oleg home (require Knaus to get in the log), there will be an simple art on the wall

Teri

Oobtain green glowing emerald-like object
Go meet the scientist Hypodermia in corner store which is beside Tycoon Mansion with unfinished construction piled up in between
Special potion for critters, cooler color and better combat damage
The hint is shown for her dialog of speaking this object too mysterious and likely would require scientist to figure it out

Clonington

Obtain mysterious blueish fruit
Go meet the scientist Hypodermia in corner store which is beside Tycoon Mansion with unfinished construction piled up in between
Run faster of his Rush ability and easier to control
The hint is shown for his dialog of speaking this fruit mysterious while complaining it and of course, likely you would go to speak up with Hypodermia, his associate

Knaus

Obtain powder bag
Talk to Icnoyotl (a kid proclaim himself a scientist) whom located at the south of Oleg's house
Enlarge dynamite blast diameters
The hint is shown when you first met him as he talked about science and any unknown item you could come to refer him.

Took me sometimes to unlock those four characters special upgrade's puzzle, though I will say it is useless to have all of those upgrade and enhancement because you generally have completed or beaten this game. All there's left his collect all available health shrine.

Purchase health shrine maps
Lumina - Oleg's house
Teri - Klaura's counter
Clonington - Hypodermia's counter
Knaus - Icnoyotl's location

Various Achievements

Complete the following achievements to unlock Xbox Live Gamerscore points.

AchievementHow to unlockPoints
Chal's endDiscover an ancient tablet.25
Chal's floodDiscover an ancient tablet.25
Chal's voiceDiscover an ancient tablet.25
Changing mindDiscover an ancient tablet.25
Changing rulerDiscover an ancient tablet.25
Changing ruleDiscover an ancient tablet.25
Contemplate futureDiscover an ancient tablet.25
Dread futureDiscover an ancient tablet.25
Empire's declineDiscover an ancient tablet.25
Empire's revoltDiscover an ancient tablet.25
Empire's ruinDiscover an ancient tablet.25
Faithfull Chal and TlalocDiscover an ancient tablet.25
Faithfull Michlan and XinuDiscover an ancient tablet.25
Faithfull disciplesDiscover an ancient tablet.25
Founder's landingDiscover an ancient tablet.25
Founder's settlingDiscover an ancient tablet.25
Founder's travelsDiscover an ancient tablet.25
Michlan's baneDiscover an ancient tablet.25
Michlan's fateDiscover an ancient tablet.25
Michlan's sinDiscover an ancient tablet.25
See futureDiscover an ancient tablet.25
Spreading dispairDiscover an ancient tablet.25
Spreading dissentDiscover an ancient tablet.25
Spreading eternityDiscover an ancient tablet.25
Sudden deathDiscover an ancient tablet.25
Sudden flightDiscover an ancient tablet.25
Sudden furyDiscover an ancient tablet.25
The blue baneDiscover an ancient tablet.25
The blue boonDiscover an ancient tablet.25
The blue fruitDiscover an ancient tablet.25
Tlaloc's festeringDiscover an ancient tablet.25
Tlaloc's wrathDiscover an ancient tablet.25
Xinu's PleaDiscover an ancient tablet.25
Xinu's fallDiscover an ancient tablet.25
Xinu's labourDiscover an ancient tablet.25