 Nyorai kuenderera mberi kweiyi ndima - Pasi rose, Halldórsson aive nemakwikwi mana akateedzana mumakwikwi eEuropean Cup kubva muna 1975 kusvika muna 1981, kusanganisira rekodhi yekusangana ye. Makwikwi ake okutanga makuru akanga ari 1974 European Athletics Championships, asi Halldórsson ane makore 25 akakundikana kubuda mumutambo wokugadzirira. Pashure pokupedza nzvimbo yechipfumbamwe pa 1976 European Athletics Indoor Championships, akapinda mumitambo yeOlympic yezhizha ya1976, kwaakauya wechi15 mumutambo wekusarudza. Akatora nzvimbo yepamusoro pamakwikwi eEuropean Athletics Indoor Championships muna 1977, achitora menduru yegoridhe yekondinendi yekutanga uye yega yebasa rake. Izvi zvakamuita iye wekutanga muIceland medalist uye shasha yemakwikwi uye anoramba ari iye chete murume ave ari pamusoro pepodhium Vala Flosadóttir akakunda vakadzi pole vault muna 1996. Gare gare gore iroro iye akakanda pachake zvakanakisisa, izvo akamira pachinzvimbo chechina munyika uye aiva Icelandic National Record anoramba nyika yechipiri yakanakisisa kupfura putter pashure Pétur Guðmundsson. 