EMB-170 First Officer reported an ENG 1 Fire EICAS warning during the climb. The flight returned to the departure airport and landed.

Narrative

Engine 1 Fire on ZZZ departure. After a heading of 040 at 5000; we were cleared up to FL230 direct ZZZZZ. At approximately 13;000 feet we received a ENG 1 Fire indication with no prior abnormal engine/flight indications. I was PF; Captain was PM. At this moment; I was setting the sunshades and after a second or so of my initial surprise of the message I quickly guarded the controls anticipating a yaw in the aircraft. Identify; Cancel Engine 1 Fire. Immediately Aviate Navigate Communicate came to mind and my job was to aviate. Captain started running through the QRC/QRH. As I focused on flying; Captain secured the engine with the associated message. Due to the high stress of the situation; they were following the checklist as prescribed and I continued to ask if there were any remaining indications of a fire just to make sure we were not rushing. Visibly; there were none but the message was still present. This was my first thought that this was a transducer or fire loop fault but of course the QRH doesn't have any notes or options for a suspicion or a fault or indication. So not that the engine was secured and I was flying on the #2 only. We communicated with ATC and the FA's (Flight Attendants) that we were returning to ZZZ. At this point; it felt like the sim and I just focused in my flying. Priority handling was requested and we descended and got set up for an ILS XXC. The aircraft was flying great and I focused on flying a smooth; stable platform throughout the approach. With a faulty indication; we technically don't know if there is a fire or not and I relayed that concern to the Captain that we just wanted to get on the ground as soon as possible. Captain asked if I was comfortable to fly the approach and elected to leave our roles as is since we were a few minutes from landing rather than transferring controls and swapping tasks at such a critical time. My military airframe experience helped as we often land with one engine in practice scenarios and that this was different but very similar. Approach was smooth and uneventful. We came to a stop and had emergency services inspect the aircraft and cleared us that there was no indications of fire. We were then lead to Gate XX. Once again they confirmed no fire indications and safe to deplane.Shortly after; Captain took lead with the passengers and FA's as I coordinated with Operations. My final note; I'm sure that there are things we could have done better and clean up; but overall our training came to the forefront of our mind and thought our CRM and Captain's leadership in a stressful situation as a LOW Captain was great and lead to an a safe; successful conclusion.