There are a lot of achivements. Let's try to enumerate and describe some of them:

The search for blue compact galaxies. Surveys.

Blue Compact Galaxies sample from the First Byurakan Survey

Creation the new BCG sample in zone of SBS

Creation the new BCG sample in the zone of Case Survey

Complex BCG studies in various domains

HST observations

HI survey of large BCG subsample in 21-cm line

VLA observations of selected BCGs

Study of specific BCG related problems

Study of Spatial Distribution of Blue Compact Galaxies

Dark Matter in Dwarf Galaxies

Galaxies with WR features and broad emission-line components. Mkn 996

Discovery of SBS 0335-052 - the galaxy with extremely low metallicity

Discovery and investigation of new component SBS 0335-052W

The complex method of stellar populations synthesis

Study of Star Formation wave propogation and the content of stellar populations across BCG body

Chemical evolution of Blue Compact Galaxies

The most precise determination of primordial Helium abundance

Elaborating new equipement and methodics for the 6-m telescope

Spectrophotometric complex in Nasmyth-1 focus. The scheme