Here is the full list of all 28 Word Sudoku by POWGI (EU) trophies - there are 10 bronze, 11 silver, 6 gold and 1 platinum.
Solve EMULATING, UNIVERSAL and BENCHMARK
Solve GUIDEPOST
Solve JUBILATED and BYSTANDER
Solve HUMDINGER
Solve GHASTLIER
Solve LUNCHTIME and ANCHOVIES
Solve SECONDARY
Solve ADJUSTING
Solve WELCOMING
Collect all the trophies
Solve WONDERFUL and DISCOVERY
Solve PATCHWORK and CARPETING
Solve WORDSMITH
Solve EDUCATION and FORMALITY
Solve STRANGELY and EMBRACING
Solve SUPERNOVA
Solve OUTWARDLY and AWESTRUCK
Solve SPLINTERY and SHIPWRECK
Solve ADORINGLY and TRIUMPHAL
Solve SKEPTICAL
Solve DEFIANTLY, BETRAYING and ADVERSITY
Solve UNCHARTED, SPIDERMAN and MINECRAFT
Solve COMBATING, DANGEROUS and MACHINERY
Solve EXPLODING and CHEMISTRY
Solve HIDEOUSLY, NEFARIOUS and SCOUNDREL
Solve ANXIOUSLY and TREMBLING
Solve PULSATING, DYSTOPIAN and NIGHTMARE
Solve CHAMPIONS