For this you only need to do these puzzles shown in this video, you can skip all the rest!
This guide will net you the full 1000gs
0:10 A welcoming start
0:40 A wonderful Discovery
1:10 Guidepost Found
1:40 Patchwork Carpeting
2:10 Wordsmith
2:40 An Education or a Formality
3:10 Secondary Level
3:40 Strangely Embracing
4:10 Supernova!
4:40 Jubilated Bystander
5:10 Outwardly Awestruck
5:40 Adjusting Difficulty
6:10 Emulating Universal Benchmark
6:40 Splintery ShipWreck
7:10 Lunchtime Anchovies
7:40 Adoringly Triumphal
8:10 Skeptical?
8:40 Defiantly Betraying Adversity
9:10 Id Rather Be Playing...
9:40 Combating Dangerous Machinery
10:10 Exploding Chemistry
10:40 A Real Humdinger & Even Ghastlier
11:10 Hideously Nefarious Scoundrel
11:40 Anxiously Trembling
12:10 Pulsating Dystopian Nightmare
12:40 Sudoku Champions!