A timeline is a way of displaying a list of events in chronological order, sometimes described as a project artifact. It is typically a graphic design showing a long bar labelled with dates alongside itself and usually events labelled on points where they would have happened.
Dictionary source: English Spanish Dictionary
English to Spanish translation of Timeline (n.) = plazo, calendario, fecha límite, plazo de tiempo, cronograma, cronología, distribución temporal, desarrollo temporal, evolución temporal. Ex: This article describes a city-wide communications network, looks behind the scenes at how it was developed, and summarises what was learned from creating the system on a tight timeline.