I partially answered my own question by reading from the Baltimore Catechism:

Q. 1398. Are the rewards in heaven and the punishments in hell the same for all who enter
into either of these states?
A. The rewards of heaven and the punishments in hell are not the same for all who enter into
either of these states, because each one's reward or punishment is in proportion to the amount of
good or evil he has done in this world. But as heaven and hell are everlasting, each one will
enjoy his reward or suffer his punishment forever.

However, it doesn't state what those rewards consist of, or if we must do specifically good acts to obtain them.

Best read St. Thomas Aquinas Summa Theologiae on this question, the Supplement to third part of the Summa, questions 93 to 96.

Here a link to q. 96, in which you seem especially interested:

http://www.newadvent.org/summa/5096.htm

That's exactly what I was looking for. Thank you, Pyrrhos. You're on a roll answering all of my questions tonight!

'ONCE also, as the Saint was about to communicate, she said: "Lord, what wilt Thou give me?" "I will give Myself to thee entirely," He replied, "with all the virtue of My Divinity, even as My Virgin Mother received Me." "But what shall I gain by this" inquired Gertrude, "more than those persons who received Thee yesterday with me, and who will not receive Thee to-day, since Thou dost always give Thyself entirely and without reserve?" Our Lord replied: "If people in the world honour one who has been a consul twice more than a person who has only once filled that office, how shall he fail of greater glory in eternity who has received Me more frequently on earth?" Then she exclaimed, sighing: "How far above me in beatitude will those priests be who communicate every day to fulfil the duties of their ministry!" "It is true," replied our Lord, "that those who celebrate worthily shall shine in great glory; but the love of him who communicates with pleasure should be judged of very differently from the exterior magnificence which appears in this mystery. There will be one reward for him who has approached with desire and love; there will be another for him who approaches with fear and reverence; and another for him who is very diligent in his preparation. But those who habitually celebrate through custom only, shall have no share in My gifts."'

- The Life & Revelations of St. Gertrude the Great

"Does not the Catholic faith teach you that I bestow Myself, with all the riches that are contained in the treasures of My Divinity and My Humanity, for the salvation of those who communicate even once and that the oftener men communicate, the more their beatitude is increased and perfected?"

Our Lord to St. Gertrude the Great, 'Life and Revelations of St. Gertrude the Great'

'ON the Feast of the glorious father St. Benedict, St. Gertrude assisted at Matins with special devotion to honour so excellent a father; and she beheld him in spirit, standing in the presence of the effulgent and ever-peaceful Trinity, radiant with glory. His countenance was full of majesty and beauty; his habit shone surpassingly; while bright and living roses seemed to spring forth from his limbs, each rose producing another, and these others, the last surpassing the first in fragrance and beauty, so that our holy father, blessed both by grace and by name, being thus adorned, gave the greatest pleasure to the adorable Trinity and the heavenly court, who rejoiced with him because of his beatitude. The roses which thus sprang forth from him signified the exercises which he had used to subjugate his flesh to his spirit, and all the holy actions which he had performed, and also those of all whom he had drawn by his persuasions or induced by his example to leave the world and live under regular discipline, who, following him in this royal road, had attained, or will yet attain, to the port of the celestial country and to life eternal, each of whom is a subject of particular glory to this great patriarch; and for which all the saints praise God, and congratulate him continually.

St. Benedict also carried a sceptre, which was marvellously embellished on each side with precious stones of great brilliancy. As he held it in his hand, the side which was turned towards him emitted a glorious light, which indicated the happiness of those who had embraced his Rule and amended their lives, and on their account God overwhelmed him with inconceivable joy. On the side which was turned towards God, the Divine justice shone forth which had been magnified in the condemnation of those who had been called to this holy Order, but who had rendered themselves unworthy of it, and therefore had been condemned to eternal flames; for it is just that he whom God has called to the holiest of Orders should be most severely punished if he lives an evil life.

Now, as St. Gertrude offered the blessed father the recital of the entire Psalter in his honour, on the part of the community, he appeared exceedingly rejoiced, and he offered the verdure with which he was adorned for the welfare of those who sought his protection with pure hearts, and walked in his footsteps by faithful observance of his Rule.

While the Response, Grandi Pater fiducia morte stetit preciosa was chanted, St. Gertrude said to him: "Holy father, what special reward have you received for your glorious death?" He replied: "Because I gave up my last breath while I was in prayer, I now emit a breath of such surpassing sweetness, that the saints delight to be near me." Then she besought him, by his glorious death, to assist each religious of that monastery in their last hour. The venerable father replied: "All who invoke me, remembering the glorious end with which God honoured me, shall be assisted by me at their death with such fidelity, that I will place myself where I see the enemy most disposed to attack them; thus, being fortified by my presence, they will escape the snares which he lays for them, and depart happily and peacefully to the enjoyment of eternal beatitude."'

- Life and Revelations of St. Gertrude the Great

This particular work contains many revelations of the rewards given different saints in Heaven.