The Sims 4
50 Achievements
1,000
2-3h
My, You've Changed!
Have a Sim become both max thin and fat within a lifetime.
20
1.07%
How to unlock the My, You've Changed! achievement in The Sims 4 - Definitive Guide
Once you clear a few and have 1500 Aspiration Points, you're set.
With your points in hand, go to the Aspiration Tag at the bottom right (the hexagonal box with a gold icon inside), click it and locate the Present icon in the box that appears. This is the Rewards Store: Click this, and you'll find a list of potions and extra traits.
In these potions, you can find Insta-Large and Insta-Lean. They cost 750 points each. Buy both, pop into your inventory (the box icon also located in the bottom right corner) and drink both potions. Once your Sim downs the drinks, the achievement will pop.
Congrats.
When creating a Sim, make sure you choose the skinniest body type available. While playing, you’ll need to cook a LOT of meals to reach Level 10 in the Cooking and Gourmet Cooking Skills. Just keep eating everything you make and after a few weeks play time, you’ll notice your Sim start to get a little round around the edges. Once they reach the maximum weight limit, the trophy will unlock. Alternatively, you can buy the "Insta-Lean" and "Insta-Large" potions for 750 points each from the Rewards Store to get fat and thin instantly.
DO NOT work on the Athletic Career or the Fitness Skill while going for this. Both of those require you to work-out on a daily basis and will prevent you from putting on any weight.