Background:Achyranthes aspera is a highly valued medicinal plant, yet its clinical use is often limited because its raw phytoconstituents have restricted topical efficacy. The optimization of its extraction methods and the targeted isolation of its bioactive secondary metabolites require systematic investigation to maximize therapeutic potential. Methods: This study evaluated Continuous Shaking Extraction (CSE), Ultrasonic Extraction (USE), and Microwave-Assisted Extraction (MAE) using 95% methanol to optimize extract yield. Comprehensive qualitative and quantitative phytochemical profiling was conducted, assessing Total Phenolic Content (TPC) and Total Flavonoid Content (TFC). Bioactive compounds were isolated using a stepwise silica gel column chromatography gradient and identified via Thin Layer Chromatography (TLC) and Fourier Transform Infrared Spectroscopy (FTIR). Antioxidant potential was assessed using DPPH and ABTS radical scavenging assays. Results: MAE emerged as the superior extraction technique, yielding 12.50% extract. The extract demonstrated a robust phytochemical profile, with a TPC of 0.575 mg GAE/100 mg and a TFC of 0.366 mg QE/100 mg. Column chromatography successfully isolated significant polyphenols, specifically Chlorogenic acid and a Quercetin derivative, validated by TLC and FTIR spectral analysis (exhibiting O–H stretching at 3462 cm⁻¹ and C=C stretching at 1447 cm⁻¹). The methanolic extract exhibited potent radical scavenging activity, with an IC₅₀ of 65.7 µg/mL in the DPPH assay. Conclusion: A. aspera leaves possess a robust polyphenolic profile with highly potent antioxidant capabilities. Optimized MAE coupled with chromatographic isolation provides an efficient pathway for extracting therapeutic phytoconstituents.