ERJ 175 First Officer reported an A/I Wing Leak warning in icing conditions along with autoflight and IRS (Inertial Reference System) malfunctions. The flight returned to the departure airport and landed.

Narrative

Pushback; taxi and takeoff were standard with nothing abnormal. In the climb I noticed my HSI (Horizontal Situation Indicator) was acting abnormal; showing a heading that didn't make sense with the current LNAV track of the aircraft. It was then accompanied with a heading miscompare" annunciation. Then; after climbing through 10000' when the A/I does its test; we received an "A-I WING LEAK" warning message. We followed the QRH and that resolved the warning; and messaged dispatch. As we continued the climb to cruise we then had an AT (Auto Throttle) FAIL and then later an AP (Autopilot) FAIL and SHAKER ANTICIPATED message. Dispatch replied to us around the same time informing us of an icing airmet later en route; and told us to return to ZZZ. We were currently IMC and requested to descend immediately; and ATC would not initially clear us for lower than FL240. We then decided to request priority handling to avoid potential icing conditions and head back to ZZZ to get lower and out of icing conditions. As we left IMC the A/T and AP started working again; however now the IRS (Inertial Reference System) 2 failed. We ran that QRH procedure then continued and landed at ZZZ. We then landed back on XXL and taxied back to the gate uneventfully.Cause: Malfunction Of Equipment; A/I Wing Leak and IRS 2 FailSuggestions: Crew decided to divert and return to ZZZ."