Yes, mostly Str and Con for a shield guardian fighter, also a high Con helps when wielding axes and hammers.
I'll give you this summary of a similar charcter I made once
====== Created Using Wizards of the Coast D&D Character Builder ======
Mondel Darkbark, level 5
Dwarf, Fighter
Build: Guardian Fighter
Fighter: Combat Superiority
Fighter Talents: One-handed Weapon Talent
Background: Enlisted Soldier (+2 to Endurance)
FINAL ABILITY SCORES
Str 17, Con 19, Dex 12, Int 10, Wis 14, Cha 8.
STARTING ABILITY SCORES
Str 16, Con 16, Dex 12, Int 10, Wis 12, Cha 8.
AC: 21 Fort: 18 Reflex: 15 Will: 14
HP: 58 Surges: 13 Surge Value: 14
TRAINED SKILLS
Intimidate +6, Endurance +13, Athletics +8, Nature +9
UNTRAINED SKILLS
Acrobatics +1, Arcana +2, Bluff +1, Diplomacy +1, Dungeoneering +6, Heal +4, History +2, Insight +4, Perception +4, Religion +2, Stealth +1, Streetwise +1, Thievery +1
FEATS
Level 1: Defender of the Wild
Level 2: Shield the Fallen
Level 4: Sudden Roots
POWERS
Fighter at-will 1: Brash Strike
Fighter at-will 1: Resolute Shield
Fighter encounter 1: Shield Bash
Fighter daily 1: Unstoppable Advance
Fighter utility 2: Unstoppable
Fighter encounter 3: Shield Edge Block
Fighter daily 5: Crack the Shell
ITEMS
Battleaxe, Heavy Shield, Scale Armor, Adventurer's Kit, Backpack (empty), Bedroll, Crossbow, Crossbow Bolts (20), Potion of Healing (heroic tier) (2)
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