LEGO Marvel's Avengers
65 Achievements
1,250
33-41h
I'm Engineering, She's Bio-chem
Set both Free Play characters as Agent Leo Fitz and Agent Jemma Simmons
10
1.56%
How to unlock the I'm Engineering, She's Bio-chem achievement in LEGO Marvel's Avengers - Definitive Guide
bLaKgRaVy
These two characters are included with the ‘MARVEL’s Agents of S.H.I.E.L.D.’ level. When you are in any level in Free Play or in any hub (most of which are accessible after completing the level ‘Earth’s Mightiest’ in the main game), select Agent Fitz as your character. Then switch characters and select Agent Simmons as your other character and the achievement will unlock.
Dougiefresh613, themindisacity
During the course of story mode, you will play as both Fitz and Simmons. However, there is no point during story mode that you play as both at the same time. You will have to do this either during your replay of the level or in the hub world. Just swap both active characters by holding 
and the trophy will pop.
