Lil Gator Game

This achievement unlocks after you finish the small island/opening area, and you're directed to check out the big island.

Complete this introductory area by finishing all the quests from your friends and then talking to Big Sis. Turns out there's a lot more to do to make an impression on her!

1st achievement of the game that unlocks after completing all three friend's quests on first island (small island) and talking with the big sis with a cutscene.


Timestamps:
00:00:00 - The Small Island
00:09:00 - 01/04 Monkey/Bracelet
00:31:10 - "Change Of Plans" Achievement
00:31:30 - The Big Island
00:42:25 - The Great Oak
01:04:10 - "Enrichment Through Invention" Achievement
01:04:40 - 02/04 Monkey/Bracelet
01:12:00 - The Playground
01:18:00 - The Splash Pad
01:18:30 - 03/04 Monkey/Bracelet
01:56:30 - "Growing With Water" Achievement
01:58:25 - The Playground
02:02:00 - The Amphitheater
02:04:50 - 04/04 Monkey/Bracelet
02:05:00 - "Infinite power!!!" Achievement
02:06:00 - "Interrupt This Broadcast" Achievement
02:25:40 - "Ascend" Achievement
02:52:00 - "Lunch By Compromise" Achievement
02:53:40 - The Playground
02:53:45 - "Oof!" Achievement
03:07:10 - "Lesson Learned" Achievement
03:08:00 - "Name Reveal!" Achievement
03:08:35 - "ACTUAL Name Reveal!" Achievement
03:09:00 - "THIS Is The Real Name" Achievement
03:09:35 - "BELIEVE ME, THIS IS THE REAL NAME" Achievement
03:10:25 - "EMBRACE THE UNKNOWN" Achievement
03:11:00 - The Completion
03:35:50 - "Under New Management" Achievement
03:37:10 - "Lizard In Space" Achievement
03:37:35 - "Hidden Scale Clan" Achievement
03:42:50 - "Demon of DIY" Achievement
03:43:00 - "Gatorangelo" Achievement
03:43:45 - "Spider-Gator" Achievement
03:46:10 - "Hero of the People" Achievement
03:58:40 - "Craftslayer" Achievement
04:00:00 - The End
04:02:25 - Subscribe!

Story related. Complete the first quest on the small island where you first spawn. Go to picnic area and speak to Jill, collect a sword/stick in the woods then go back and speak to Jill again.
Head over to the decking area over at the right side of island and speak to Martin, collect the dustbin lid for him and go back and speak to him.
I'd recommend buying the 1st Bracelet from the Monkey here by follow water inland to help you climb. Continue heading around up the mountain path and you'll find Avery the frog, you need at least 100 junk to buy the hat. Once you have these 3 items, head back to where Big Sis is and speak to her.

This guide will walk you through all of the achievements in around 3-4 hours, timestamps are below the video


ACHIEVEMENTS TIMESTAMPS
12:50 – 1st Bracelet (Part 1 of Infinite Power Achievement)
25:21 – Change of Plan Achievement
33:21 – Enrichment Through Invention Achievement (Jill’s Quest)
49:50 – 2nd Bracelet (Part 2 of Infinite Power Achievement)
58:37 – 3rd Bracelet (Part 3 of Infinite Power Achievement)
1:00:35 – Growing With Water Achievement (Martin’s Quest)
1:28:00 – 4th Bracelet (Part 4 of Infinite Power Achievement)
1:30:11 – Lunch by Compromise Achievement (Avery’s Quest)
2:04:00 – Lesson Learned Achievement
2:16:18 – Name Reveal Achievement
2:17:45 – ACTUAL Name Reveal Achievement
2:18:19 – THIS is the Real Name Achievement
2:19:04 – BELIEVE ME, THIS IS THE REAL NAME Achievement
2:19:43 – EMBRACE THE UNKNOWN Achievement
2:20:10 – Interrupt This Broadcast Achievement
2:20:30 – Ascend Achievement
2:21:46 – Oof! Achievement
2:22:22 – Start of Hero of the People Achievement
2:23:34 – Under New Management Achievement
2:26:37 – Spider-Gator Achievement
2:27:30 – Hero of the People Achievement (continued)
2:30:00 – Craftslayer Achievement
2:32:47 – Demon of DIY Achievement
2:33:40 – Gatorangelo Achievement
2:34:06 – Lizard in Space Achievement
2:34:35 – Hidden Scale Clan Achievement