Hernando Arrechea had the following podium finishes at major championships: 3rd in the 1967 Pan American Games 4×100 metres Relay (with [Pedro Grajales] and the non-Olympians Carlos Álvarez and Jaime Uribe). In the 1967 Pan American Games 110 metres hurdles Arrechea finished fifth.
Personal Best: 110H – 14.09 (1968).
|1968 Summer||21||Ciudad de México||Athletics||Men's 110 metres Hurdles||Colombia||COL||5 h2 r1/3|
|1968 Summer||21||Ciudad de México||Athletics||Colombia||Round One||Heat Two||5||14.0||14.09|