Metatarsals III and IV were stocky, measuring and respectively, indicating that the length of the metatarsus was under the 50% of the tibial length. As in other maniraptorans, the metatarsals were closely united. The top end of metatarsal III was side to side flattened and not pinched at the upper end, thus lacking an arctometatarsalian (pinched upper end) condition. The lower end of metatarsal IV had a joint where motion was restricted to one plane, and the lateral condyle was short. The pelvis was formed by the pubis, ilium and ischium bones. The ilium was prominently tall measuring in length and in height with the preacetabular process situated from top to bottom. Both insertions for the m. "caudofemoralis" were located at the inner surface of the ilium. On the anterior edge were microstriations that likely gave form to the m. "iliofemoralis" in life, behind to this area, traces of the m. "ilio tibialis-2" were also present. The pubis measured long and is very straight having a large pubic boot (a wide expansion at the end). While other dromaeosaurids had a very opisthopubic pelvic configuration, "Achillobator" had a primitive propubic configuration. The large pubic boot had coarse areas on the dorsal surface that served as attachment sites for the m. "pubo ischio femoralis internus ventralis". Its lateral surface was very flat and had numerous microstriations that probably originated the m. "pubo ischio femoralis externus". The ischium was shorter than the ilium and pubis, measuring in length. A large ridge was formed on its shaft and expanded to the anterior edge, likely forming the m. "adductor femoris" in life. This ridge-like structure was heavy-built compared to other dromaeosaurids. At the lateral sides the surface was very rough, possibly attaching m. "flexor tibialis internus-1" in life.