The Sims 4
50 Achievements
1,000
2-3h
Elementary
Have a Sim reach max level in the Logic skill.
20
1.55%
How to unlock the Elementary achievement in The Sims 4 - Definitive Guide
Lymiss
TrueAchievements
TrueAchievements
The logic skill can be start by either buying a chess table, a telescope or buying the logic books from the bookshelf. There are several jobs and one aspiration that require the logic skill, so you can level up a sim while also working towards that next promotion.
I found the easiest way to get a sim maxed out in logic is to have them play chess whenever they can and to have the lot trait set to science lair. I didn't use a child since I don't have one yet in the game and it took about 3 hours of playing (real world).
Kimitchii
TrueAchievements
TrueAchievements
So, to do that,you need to do the following :
Step 1 : Press
, it should open a command box on the top left corner of your screen, press 
Step 2 : Type the following into your command box Traits.equip_trait SteelBladder and then press Start to gain the trait SteelBladder.
Step 3 : Now repeat step 2 but instead of SteelBladder, enter the following traits :
Needs traits : NeverWeary (Energy need never decrease), ForeverFresh (Hygiene need never decrease), ForeverFull(Hunger need never decrease), NeedsNoOne (Social need never decrease). The only need that will keep going down, depending on the skill you're mastering is the "Fun" one.
Useful traits : Savant (Helps learn skills faster), MorningSim (Helps learn skills faster in the morning)/NightOwl (Helps learn skills faster during the night), sadly only one of those two can be picked.
{I believe I have listed all the traits I used to master my skills but if I forgot some, I will add them later.}
Once you are done adding all required traits, you can click on a chess table and select "Play" and then speed the game on the fastest speed and let your Sim level up its Logic skill. Thanks to the traits, unless you have a job, you can go from 0 to 10 in one go.
Yes, its cheap, but since it doesn't disable your achievement, why not?
Hope it is useful! Please do leave your comments if you have anything to add.
DaveKinetic
TrueTrophies
TrueTrophies
The quickest way to reach level 10 in the Logic skill is to buy the three Logic books which will bring you up to level 9, and then buy a chess table and keep playing chess until you complete the final level. For an added speed boost, you can use the Science Lair lot trait for a +50% skill gain.
Once you reach level 10 in the Logic skill, the trophy will unlock.
Resolute, Velvet
The Logic Skill is required for the Writer Career (Author Branch), Business Career (both Branches), and the Secret Agent Career (both Branches). There are a few ways to level this up, but the most recommended is to play just Chess until you reach level max level. Reading books will increase your skill level as well, just not as efficiently.
Your skill with increase faster if you have the “Focused” Moodlet active. It’s recommended that you paint a “Focused Painting” and hang it by the Chess Table. To create one, you will need a Chess Table and an Easel. “Play Chess” at the Chess Table to gain the Focused Moodlet. Once it’s active, you will have the option to “Paint a Mathematical Diagram”. Once it’s complete, open your Sim’s inventory, hover over the painting, and press 
to pick it up. Place it on the wall near the Chess Table.
When you click on the painting, you will have the option to “Turn on Emotional Aura”. This Aura will give you a permanent Focus Moodlet so long as you are close by. Make sure whenever you’re at the Chess Table, the aura is turned on.
While Focused, just keep playing Chess and when you reach Level 10 (Max Level), the trophy will unlock.
If you are completing Aspirations for aspiration points, you want to work on Knowledge - Nerd Brain one while leveling up this skill.
